Replace NULL with nullptr in webrtc/video.

webrtc/video/video_capture_input_unittest.cc

 /*
  *  Copyright (c) 2014 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/video/video_capture_input.h"
@@ skipping 205 matching lines @@
   input_frames_.push_back(std::unique_ptr<VideoFrame>(
       new VideoFrame(test::FakeNativeHandle::CreateFrame(
           dummy_handle, 1, 1, 2, 2, webrtc::kVideoRotation_0))));
   AddInputFrame(input_frames_[1].get());
   WaitOutputFrame();
 
   EXPECT_TRUE(EqualFramesVector(input_frames_, output_frames_));
 }
 
 bool EqualFrames(const VideoFrame& frame1, const VideoFrame& frame2) {
-  if (frame1.native_handle() != NULL || frame2.native_handle() != NULL)
+  if (frame1.native_handle() || frame2.native_handle())
     return EqualTextureFrames(frame1, frame2);
   return EqualBufferFrames(frame1, frame2);
 }
 
 bool EqualTextureFrames(const VideoFrame& frame1, const VideoFrame& frame2) {
   return ((frame1.native_handle() == frame2.native_handle()) &&
           (frame1.width() == frame2.width()) &&
           (frame1.height() == frame2.height()));
 }
 
@@ skipping 33 matching lines @@
   const int kSizeY = width * height * 2;
   uint8_t buffer[kSizeY];
   memset(buffer, data, kSizeY);
   frame->CreateFrame(buffer, buffer, buffer, width, height, width, width / 2,
                      width / 2, kVideoRotation_0);
   frame->set_render_time_ms(data);
   return frame;
 }
 
 }  // namespace webrtc