diff --git a/net/tools/naive/naive_client_connection.cc b/net/tools/naive/naive_client_connection.cc
index afed66d21b..53d0a57fde 100644
--- a/net/tools/naive/naive_client_connection.cc
+++ b/net/tools/naive/naive_client_connection.cc
@@ -56,7 +56,7 @@ NaiveClientConnection::~NaiveClientConnection() {
 int NaiveClientConnection::Connect(const CompletionCallback& callback) {
   DCHECK(client_socket_);
   DCHECK_EQ(next_state_, STATE_NONE);
-  DCHECK(connect_callback_.is_null());
+  DCHECK(!connect_callback_);
 
   if (full_duplex_)
     return OK;
@@ -84,7 +84,7 @@ void NaiveClientConnection::Disconnect() {
 
 void NaiveClientConnection::DoCallback(int result) {
   DCHECK_NE(result, ERR_IO_PENDING);
-  DCHECK(!connect_callback_.is_null());
+  DCHECK(connect_callback_);
 
   // Since Run() may result in Read being called,
   // clear connect_callback_ up front.
@@ -181,7 +181,7 @@ int NaiveClientConnection::Run(const CompletionCallback& callback) {
   DCHECK(client_socket_);
   DCHECK(server_socket_handle_->socket());
   DCHECK_EQ(next_state_, STATE_NONE);
-  DCHECK(connect_callback_.is_null());
+  DCHECK(!connect_callback_);
 
   run_callback_ = callback;
 
diff --git a/net/tools/naive/socks5_server_socket.cc b/net/tools/naive/socks5_server_socket.cc
index 191e3e304a..55fe79bf80 100644
--- a/net/tools/naive/socks5_server_socket.cc
+++ b/net/tools/naive/socks5_server_socket.cc
@@ -53,7 +53,7 @@ Socks5ServerSocket::~Socks5ServerSocket() {
 int Socks5ServerSocket::Connect(const CompletionCallback& callback) {
   DCHECK(transport_);
   DCHECK_EQ(STATE_NONE, next_state_);
-  DCHECK(user_callback_.is_null());
+  DCHECK(!user_callback_);
 
   // If already connected, then just return OK.
   if (completed_handshake_)
@@ -173,8 +173,8 @@ int Socks5ServerSocket::Read(IOBuffer* buf,
                              const CompletionCallback& callback) {
   DCHECK(completed_handshake_);
   DCHECK_EQ(STATE_NONE, next_state_);
-  DCHECK(user_callback_.is_null());
-  DCHECK(!callback.is_null());
+  DCHECK(!user_callback_);
+  DCHECK(callback);
 
   int rv = transport_->Read(buf, buf_len,
                             base::Bind(&Socks5ServerSocket::OnReadWriteComplete,
@@ -191,8 +191,8 @@ int Socks5ServerSocket::Write(IOBuffer* buf,
                               const CompletionCallback& callback) {
   DCHECK(completed_handshake_);
   DCHECK_EQ(STATE_NONE, next_state_);
-  DCHECK(user_callback_.is_null());
-  DCHECK(!callback.is_null());
+  DCHECK(!user_callback_);
+  DCHECK(callback);
 
   int rv =
       transport_->Write(buf, buf_len,
@@ -213,7 +213,7 @@ int Socks5ServerSocket::SetSendBufferSize(int32_t size) {
 
 void Socks5ServerSocket::DoCallback(int result) {
   DCHECK_NE(ERR_IO_PENDING, result);
-  DCHECK(!user_callback_.is_null());
+  DCHECK(user_callback_);
 
   // Since Run() may result in Read being called,
   // clear user_callback_ up front.
@@ -232,7 +232,7 @@ void Socks5ServerSocket::OnIOComplete(int result) {
 void Socks5ServerSocket::OnReadWriteComplete(const CompletionCallback& callback,
                                              int result) {
   DCHECK_NE(ERR_IO_PENDING, result);
-  DCHECK(!callback.is_null());
+  DCHECK(callback);
 
   if (result > 0)
     was_ever_used_ = true;