diff --git a/src/base/trace_event/base_tracing_forward.h b/src/base/trace_event/base_tracing_forward.h
index f72f9fde2f..bd8fad8126 100644
--- a/src/base/trace_event/base_tracing_forward.h
+++ b/src/base/trace_event/base_tracing_forward.h
@@ -10,7 +10,7 @@
 
 #include "base/tracing_buildflags.h"
 
-#if BUILDFLAG(ENABLE_BASE_TRACING)
+#if 1
 #include "third_party/perfetto/include/perfetto/tracing/traced_value_forward.h"  // nogncheck
 #else
 
diff --git a/src/base/trace_event/memory_allocator_dump.h b/src/base/trace_event/memory_allocator_dump.h
index 97799e978e..b585a7cbb2 100644
--- a/src/base/trace_event/memory_allocator_dump.h
+++ b/src/base/trace_event/memory_allocator_dump.h
@@ -5,6 +5,8 @@
 #ifndef BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
 #define BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
 
+#include "base/trace_event/trace_event_stub.h"
+#if 0
 #include <stdint.h>
 
 #include <iosfwd>
@@ -159,4 +161,5 @@ void BASE_EXPORT PrintTo(const MemoryAllocatorDump::Entry&, std::ostream*);
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_H_
diff --git a/src/base/trace_event/memory_dump_manager.h b/src/base/trace_event/memory_dump_manager.h
index 1ebb2f8f0c..2c1856d413 100644
--- a/src/base/trace_event/memory_dump_manager.h
+++ b/src/base/trace_event/memory_dump_manager.h
@@ -5,6 +5,8 @@
 #ifndef BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_
 
+#include "base/trace_event/trace_event_stub.h"
+#if 0
 #include <stdint.h>
 
 #include <map>
@@ -267,4 +269,5 @@ class BASE_EXPORT MemoryDumpManager {
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_MANAGER_H_
diff --git a/src/base/trace_event/memory_dump_provider.h b/src/base/trace_event/memory_dump_provider.h
index 983940772c..94d0d7f2a2 100644
--- a/src/base/trace_event/memory_dump_provider.h
+++ b/src/base/trace_event/memory_dump_provider.h
@@ -5,6 +5,8 @@
 #ifndef BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_
 #define BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_
 
+#include "base/trace_event/trace_event_stub.h"
+#if 0
 #include "base/base_export.h"
 #include "base/process/process_handle.h"
 #include "base/trace_event/memory_dump_request_args.h"
@@ -48,4 +50,5 @@ class BASE_EXPORT MemoryDumpProvider {
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_MEMORY_DUMP_PROVIDER_H_
diff --git a/src/base/trace_event/process_memory_dump.h b/src/base/trace_event/process_memory_dump.h
index b9b9e980f3..6c30772612 100644
--- a/src/base/trace_event/process_memory_dump.h
+++ b/src/base/trace_event/process_memory_dump.h
@@ -5,6 +5,8 @@
 #ifndef BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 
+#include "base/trace_event/trace_event_stub.h"
+#if 0
 #include <stddef.h>
 
 #include <map>
@@ -296,4 +298,5 @@ class BASE_EXPORT ProcessMemoryDump {
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
diff --git a/src/base/trace_event/trace_event.h b/src/base/trace_event/trace_event.h
index c5621c336b..bfb61acb81 100644
--- a/src/base/trace_event/trace_event.h
+++ b/src/base/trace_event/trace_event.h
@@ -5,6 +5,8 @@
 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_H_
 
+#include "base/trace_event/trace_event_stub.h"
+#if 0
 // This header file defines implementation details of how the trace macros in
 // trace_event_common.h collect and store trace events. Anything not
 // implementation-specific should go in trace_event_common.h instead of here.
@@ -804,4 +806,5 @@ class TraceScopedTrackableObject {
 }  // namespace trace_event
 }  // namespace base
 
+#endif
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_
diff --git a/src/base/trace_event/trace_event_stub.cc b/src/base/trace_event/trace_event_stub.cc
index f227101ea4..605a20d9e5 100644
--- a/src/base/trace_event/trace_event_stub.cc
+++ b/src/base/trace_event/trace_event_stub.cc
@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "base/trace_event/memory_usage_estimator.h"
 #include "base/trace_event/trace_event_stub.h"
 
 namespace base {
@@ -20,6 +21,9 @@ MemoryDumpProvider::~MemoryDumpProvider() = default;
 // static
 constexpr const char* const MemoryDumpManager::kTraceCategory;
 
+template size_t EstimateMemoryUsage(const std::string&);
+template size_t EstimateMemoryUsage(const std::u16string&);
+
 }  // namespace trace_event
 }  // namespace base
 
diff --git a/src/base/trace_event/trace_event_stub.h b/src/base/trace_event/trace_event_stub.h
index bd79d13b61..d06f7ceabf 100644
--- a/src/base/trace_event/trace_event_stub.h
+++ b/src/base/trace_event/trace_event_stub.h
@@ -11,6 +11,8 @@
 #include <string>
 
 #include "base/base_export.h"
+#include "base/check.h"
+#include "base/memory/ref_counted.h"
 #include "base/strings/string_piece.h"
 #include "base/trace_event/common/trace_event_common.h"
 #include "base/trace_event/memory_allocator_dump_guid.h"
@@ -172,6 +174,41 @@ class BASE_EXPORT MemoryDumpProvider {
   MemoryDumpProvider() = default;
 };
 
+class BASE_EXPORT MemoryAllocatorDump {
+ public:
+  static constexpr char* kNameSize = nullptr;
+  static constexpr char* kNameObjectCount = nullptr;
+  static constexpr char* kUnitsBytes = nullptr;
+  static constexpr char* kUnitsObjects = nullptr;
+  static constexpr char* kTypeScalar = nullptr;
+  static constexpr char* kTypeString = nullptr;
+  void AddScalar(const char* name, const char* units, uint64_t value) {}
+  void AddString(const char* name,
+                 const char* units,
+                 const std::string& value) {}
+  const std::string& absolute_name() const { return absolute_name_; }
+  const MemoryAllocatorDumpGuid& guid() const { return guid_; }
+
+ private:
+  const std::string absolute_name_;
+  MemoryAllocatorDumpGuid guid_;
+};
+
+class BASE_EXPORT ProcessMemoryDump {
+ public:
+  MemoryAllocatorDump* CreateAllocatorDump(const std::string& absolute_name) {
+    CHECK(false);
+    return nullptr;
+  }
+  MemoryAllocatorDump* GetAllocatorDump(
+      const std::string& absolute_name) const {
+    CHECK(false);
+    return nullptr;
+  }
+  void AddOwnershipEdge(const MemoryAllocatorDumpGuid& source,
+                        const MemoryAllocatorDumpGuid& target) {}
+};
+
 class BASE_EXPORT MemoryDumpManager {
  public:
   static constexpr const char* const kTraceCategory =
@@ -189,19 +226,19 @@ class TracedArray;
 class TracedDictionary;
 class EventContext;
 
-class StaticString {
+class BASE_EXPORT StaticString {
  public:
   template <typename T>
   StaticString(T) {}
 };
 
-class DynamicString {
+class BASE_EXPORT DynamicString {
  public:
   template <typename T>
   explicit DynamicString(T) {}
 };
 
-class TracedValue {
+class BASE_EXPORT TracedValue {
  public:
   void WriteInt64(int64_t) && {}
   void WriteUInt64(uint64_t) && {}
@@ -216,7 +253,7 @@ class TracedValue {
   TracedArray WriteArray() &&;
 };
 
-class TracedDictionary {
+class BASE_EXPORT TracedDictionary {
  public:
   TracedValue AddItem(StaticString) { return TracedValue(); }
   TracedValue AddItem(DynamicString) { return TracedValue(); }
@@ -232,7 +269,7 @@ class TracedDictionary {
   TracedArray AddArray(DynamicString);
 };
 
-class TracedArray {
+class BASE_EXPORT TracedArray {
  public:
   TracedValue AppendItem() { return TracedValue(); }
 
@@ -244,7 +281,7 @@ class TracedArray {
 };
 
 template <class T>
-void WriteIntoTracedValue(TracedValue, T&&) {}
+BASE_EXPORT void WriteIntoTracedValue(TracedValue, T&&) {}
 
 }  // namespace perfetto
 
diff --git a/src/net/BUILD.gn b/src/net/BUILD.gn
index 32439b1fbd..ddd298237c 100644
--- a/src/net/BUILD.gn
+++ b/src/net/BUILD.gn
@@ -679,8 +679,6 @@ component("net") {
     "log/net_log_values.h",
     "log/net_log_with_source.cc",
     "log/net_log_with_source.h",
-    "log/trace_net_log_observer.cc",
-    "log/trace_net_log_observer.h",
     "nqe/cached_network_quality.cc",
     "nqe/cached_network_quality.h",
     "nqe/effective_connection_type.cc",