Mojo: NULL -> nullptr in mojo/system and mojo/embedder.

mojo/system/message_pipe_test_utils.cc

 // Copyright 2014 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 "mojo/system/message_pipe_test_utils.h"
 
 #include "base/bind.h"
 #include "base/threading/platform_thread.h"  // For |Sleep()|.
 #include "mojo/system/channel.h"
 #include "mojo/system/channel_endpoint.h"
 #include "mojo/system/message_pipe.h"
 #include "mojo/system/waiter.h"
 
 namespace mojo {
 namespace system {
 namespace test {
 
 MojoResult WaitIfNecessary(scoped_refptr<MessagePipe> mp,
                            MojoHandleSignals signals,
                            HandleSignalsState* signals_state) {
   Waiter waiter;
   waiter.Init();
 
   MojoResult add_result = mp->AddWaiter(0, &waiter, signals, 0, signals_state);
   if (add_result != MOJO_RESULT_OK) {
     return (add_result == MOJO_RESULT_ALREADY_EXISTS) ? MOJO_RESULT_OK
                                                       : add_result;
   }
 
-  MojoResult wait_result = waiter.Wait(MOJO_DEADLINE_INDEFINITE, NULL);
+  MojoResult wait_result = waiter.Wait(MOJO_DEADLINE_INDEFINITE, nullptr);
   mp->RemoveWaiter(0, &waiter, signals_state);
   return wait_result;
 }
 
 ChannelThread::ChannelThread(embedder::PlatformSupport* platform_support)
     : platform_support_(platform_support),
       test_io_thread_(base::TestIOThread::kManualStart) {
 }
 
 ChannelThread::~ChannelThread() {
@@ skipping 46 matching lines @@
   // message pipe endpoint is attached.
   CHECK_EQ(channel_->AttachEndpoint(channel_endpoint),
            Channel::kBootstrapEndpointId);
   CHECK(channel_->RunMessagePipeEndpoint(Channel::kBootstrapEndpointId,
                                          Channel::kBootstrapEndpointId));
 }
 
 void ChannelThread::ShutdownChannelOnIOThread() {
   CHECK(channel_.get());
   channel_->Shutdown();
-  channel_ = NULL;
+  channel_ = nullptr;
 }
 
 #if !defined(OS_IOS)
 MultiprocessMessagePipeTestBase::MultiprocessMessagePipeTestBase()
     : channel_thread_(&platform_support_) {
 }
 
 MultiprocessMessagePipeTestBase::~MultiprocessMessagePipeTestBase() {
 }
 
 void MultiprocessMessagePipeTestBase::Init(scoped_refptr<ChannelEndpoint> ep) {
   channel_thread_.Start(helper_.server_platform_handle.Pass(), ep);
 }
 #endif
 
 }  // namespace test
 }  // namespace system
 }  // namespace mojo