Replace NULL with nullptr in webrtc/video.

webrtc/video/end_to_end_tests.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 <algorithm>
@@ skipping 1510 matching lines @@
   };
 
   class TransportSequenceNumberTester : public MultiStreamTest {
    public:
     TransportSequenceNumberTester()
         : first_media_ssrc_(0), observer_(nullptr) {}
     virtual ~TransportSequenceNumberTester() {}
 
    protected:
     void Wait() override {
-      RTC_DCHECK(observer_ != nullptr);
+      RTC_DCHECK(observer_);
       EXPECT_TRUE(observer_->Wait());
     }
 
     void UpdateSendConfig(
         size_t stream_index,
         VideoSendStream::Config* send_config,
         VideoEncoderConfig* encoder_config,
         test::FrameGeneratorCapturer** frame_generator) override {
       send_config->rtp.extensions.clear();
       send_config->rtp.extensions.push_back(
@@ skipping 1121 matching lines @@
         assert(stats.current_payload_type == -1 ||
                stats.current_payload_type == kFakeVideoSendPayloadType);
         receive_stats_filled_["IncomingPayloadType"] |=
             stats.current_payload_type == kFakeVideoSendPayloadType;
       }
 
       return AllStatsFilled(receive_stats_filled_);
     }
 
     bool CheckSendStats() {
-      RTC_DCHECK(send_stream_ != nullptr);
+      RTC_DCHECK(send_stream_);
       VideoSendStream::Stats stats = send_stream_->GetStats();
 
       send_stats_filled_["NumStreams"] |=
           stats.substreams.size() == expected_send_ssrcs_.size();
 
       send_stats_filled_["CpuOveruseMetrics"] |=
           stats.avg_encode_time_ms != 0 && stats.encode_usage_percent != 0;
 
       send_stats_filled_["EncoderImplementationName"] |=
           stats.encoder_implementation_name ==
@@ skipping 924 matching lines @@
    private:
     bool video_observed_;
     bool audio_observed_;
     SequenceNumberUnwrapper unwrapper_;
     std::set<int64_t> received_packet_ids_;
   } test;
 
   RunBaseTest(&test);
 }
 }  // namespace webrtc