Replace NULL with nullptr in all C++ files.

webrtc/test/vcm_capturer.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include "webrtc/test/vcm_capturer.h"
 
 #include "webrtc/modules/video_capture/video_capture_factory.h"
 #include "webrtc/video_send_stream.h"
 
 namespace webrtc {
 namespace test {
 
-VcmCapturer::VcmCapturer() : started_(false), sink_(nullptr), vcm_(NULL) {}
+VcmCapturer::VcmCapturer() : started_(false), sink_(nullptr), vcm_(nullptr) {}
 
 bool VcmCapturer::Init(size_t width, size_t height, size_t target_fps) {
   VideoCaptureModule::DeviceInfo* device_info =
       VideoCaptureFactory::CreateDeviceInfo();
 
   char device_name[256];
   char unique_name[256];
   if (device_info->GetDeviceName(0, device_name, sizeof(device_name),
                                  unique_name, sizeof(unique_name)) !=
       0) {
@@ skipping 22 matching lines @@
   return true;
 }
 
 VcmCapturer* VcmCapturer::Create(size_t width,
                                  size_t height,
                                  size_t target_fps) {
   VcmCapturer* vcm_capturer = new VcmCapturer();
   if (!vcm_capturer->Init(width, height, target_fps)) {
     // TODO(pbos): Log a warning that this failed.
     delete vcm_capturer;
-    return NULL;
+    return nullptr;
   }
   return vcm_capturer;
 }
 
 
 void VcmCapturer::Start() {
   rtc::CritScope lock(&crit_);
   started_ = true;
 }
 
@@ skipping 28 matching lines @@
 VcmCapturer::~VcmCapturer() { Destroy(); }
 
 void VcmCapturer::OnFrame(const VideoFrame& frame) {
   rtc::CritScope lock(&crit_);
   if (started_ && sink_)
     sink_->OnFrame(frame);
 }
 
 }  // test
 }  // webrtc