replace NULL->nullptr in src/remoting.

remoting/host/client_session_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 206 matching lines @@
       .WillRepeatedly(Return(false));
 
   input_injector_.reset(new MockInputInjector());
 
   session_config_ = SessionConfig::ForTest();
 }
 
 void ClientSessionTest::TearDown() {
   // Clear out |task_runner_| reference so the loop can quit, and run it until
   // it does.
-  task_runner_ = NULL;
+  task_runner_ = nullptr;
   run_loop_.Run();
 }
 
 void ClientSessionTest::CreateClientSession() {
   // Mock protocol::Session APIs called directly by ClientSession.
   protocol::MockSession* session = new MockSession();
   EXPECT_CALL(*session, config()).WillRepeatedly(ReturnRef(session_config_));
   EXPECT_CALL(*session, jid()).WillRepeatedly(ReturnRef(client_jid_));
   EXPECT_CALL(*session, SetEventHandler(_));
 
   // Mock protocol::ConnectionToClient APIs called directly by ClientSession.
-  // HostStub is not touched by ClientSession, so we can safely pass NULL.
+  // HostStub is not touched by ClientSession, so we can safely pass nullptr.
   scoped_ptr<MockConnectionToClient> connection(
-      new MockConnectionToClient(session, NULL));
+      new MockConnectionToClient(session, nullptr));
   EXPECT_CALL(*connection, session()).WillRepeatedly(Return(session));
   EXPECT_CALL(*connection, client_stub())
       .WillRepeatedly(Return(&client_stub_));
   EXPECT_CALL(*connection, video_stub()).WillRepeatedly(Return(&video_stub_));
   EXPECT_CALL(*connection, Disconnect());
   connection_ = connection.get();
 
   client_session_.reset(new ClientSession(
       &session_event_handler_,
       task_runner_, // Audio thread.
       task_runner_, // Input thread.
       task_runner_, // Capture thread.
       task_runner_, // Encode thread.
       task_runner_, // Network thread.
       task_runner_, // UI thread.
       connection.Pass(),
       desktop_environment_factory_.get(),
       base::TimeDelta(),
-      NULL,
+      nullptr,
       extensions_));
 }
 
 void ClientSessionTest::DisconnectClientSession() {
   client_session_->DisconnectSession();
   // MockSession won't trigger OnConnectionClosed, so fake it.
   client_session_->OnConnectionClosed(client_session_->connection(),
                                       protocol::OK);
 }
 
@@ skipping 537 matching lines @@
 
   DisconnectClientSession();
   StopClientSession();
 
   // ext1 was instantiated and wrapped the video capturer.
   EXPECT_TRUE(extension.was_instantiated());
   EXPECT_TRUE(extension.has_wrapped_video_capturer());
 }
 
 }  // namespace remoting