Replace NULL with nullptr in all C++ files.

webrtc/media/engine/webrtcvideocapturer.cc

 /*
  *  Copyright (c) 2011 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.
  */
 
@@ skipping 297 matching lines @@
   // TODO(juberti): Determine if the VCM exposes any drop stats we can use.
   double drop_ratio = 0.0;
   LOG(LS_INFO) << "Camera '" << GetId() << "' stopped after capturing "
                << captured_frames_ << " frames and dropping "
                << drop_ratio << "%";
 
   // Clear any pending async invokes (that OnIncomingCapturedFrame may have
   // caused).
   async_invoker_.reset();
 
-  SetCaptureFormat(NULL);
+  SetCaptureFormat(nullptr);
   start_thread_ = nullptr;
   SetCaptureState(CS_STOPPED);
 }
 
 bool WebRtcVideoCapturer::IsRunning() {
-  return (module_ != NULL && module_->CaptureStarted());
+  return (module_ != nullptr && module_->CaptureStarted());
 }
 
 bool WebRtcVideoCapturer::GetPreferredFourccs(std::vector<uint32_t>* fourccs) {
   if (!fourccs) {
     return false;
   }
 
   fourccs->clear();
   for (size_t i = 0; i < arraysize(kSupportedFourCCs); ++i) {
     fourccs->push_back(kSupportedFourCCs[i].fourcc);
@@ skipping 12 matching lines @@
   if (1 == captured_frames_) {
     LOG(LS_INFO) << "Captured frame size "
                  << sample.width() << "x" << sample.height()
                  << ". Expected format " << GetCaptureFormat()->ToString();
   }
 
   VideoCapturer::OnFrame(sample, sample.width(), sample.height());
 }
 
 }  // namespace cricket