replace NULL->nullptr in src/remoting.

remoting/host/desktop_session_proxy.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 "remoting/host/desktop_session_proxy.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/process/process_handle.h"
 #include "base/memory/shared_memory.h"
@@ skipping 430 matching lines @@
 
 scoped_refptr<DesktopSessionProxy::IpcSharedBufferCore>
 DesktopSessionProxy::GetSharedBufferCore(int id) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   SharedBuffers::const_iterator i = shared_buffers_.find(id);
   if (i != shared_buffers_.end()) {
     return i->second;
   } else {
     LOG(ERROR) << "Failed to find the shared buffer " << id;
-    return NULL;
+    return nullptr;
   }
 }
 
 void DesktopSessionProxy::OnAudioPacket(const std::string& serialized_packet) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   // Parse a serialized audio packet. No further validation is done since
   // the message was sent by more privileged process.
   scoped_ptr<AudioPacket> packet(new AudioPacket());
   if (!packet->ParseFromString(serialized_packet)) {
     LOG(ERROR) << "Failed to parse AudioPacket.";
     return;
   }
 
   // Pass a captured audio packet to |audio_capturer_|.
   audio_capture_task_runner_->PostTask(
       FROM_HERE, base::Bind(&IpcAudioCapturer::OnAudioPacket, audio_capturer_,
                             base::Passed(&packet)));
 }
 
 void DesktopSessionProxy::OnCreateSharedBuffer(
     int id,
     IPC::PlatformFileForTransit handle,
     uint32 size) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   scoped_refptr<IpcSharedBufferCore> shared_buffer =
       new IpcSharedBufferCore(id, handle, desktop_process_, size);
 
-  if (shared_buffer->memory() != NULL &&
+  if (shared_buffer->memory() != nullptr &&
       !shared_buffers_.insert(std::make_pair(id, shared_buffer)).second) {
     LOG(ERROR) << "Duplicate shared buffer id " << id << " encountered";
   }
 }
 
 void DesktopSessionProxy::OnReleaseSharedBuffer(int id) {
   DCHECK(caller_task_runner_->BelongsToCurrentThread());
 
   // Drop the cached reference to the buffer.
   shared_buffers_.erase(id);
@@ skipping 76 matching lines @@
 }
 
 // static
 void DesktopSessionProxyTraits::Destruct(
     const DesktopSessionProxy* desktop_session_proxy) {
   desktop_session_proxy->caller_task_runner_->DeleteSoon(FROM_HERE,
                                                          desktop_session_proxy);
 }
 
 }  // namespace remoting