Replace NULL with nullptr in all C++ files.

webrtc/modules/rtp_rtcp/source/rtp_format_h264_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.
  */
 
@@ skipping 529 matching lines @@
 }
 
 class RtpDepacketizerH264Test : public ::testing::Test {
  protected:
   RtpDepacketizerH264Test()
       : depacketizer_(RtpDepacketizer::Create(kRtpVideoH264)) {}
 
   void ExpectPacket(RtpDepacketizer::ParsedPayload* parsed_payload,
                     const uint8_t* data,
                     size_t length) {
-    ASSERT_TRUE(parsed_payload != NULL);
+    ASSERT_TRUE(parsed_payload != nullptr);
     EXPECT_THAT(std::vector<uint8_t>(
                     parsed_payload->payload,
                     parsed_payload->payload + parsed_payload->payload_length),
                 ::testing::ElementsAreArray(data, length));
   }
 
   std::unique_ptr<RtpDepacketizer> depacketizer_;
 };
 
 TEST_F(RtpDepacketizerH264Test, TestSingleNalu) {
@@ skipping 328 matching lines @@
   const RTPVideoHeaderH264& h264 = payload.type.Video.codecHeader.H264;
   EXPECT_EQ(kH264SingleNalu, h264.packetization_type);
   EXPECT_EQ(kSei, h264.nalu_type);
   ASSERT_EQ(1u, h264.nalus_length);
   EXPECT_EQ(static_cast<H264::NaluType>(kSei), h264.nalus[0].type);
   EXPECT_EQ(-1, h264.nalus[0].sps_id);
   EXPECT_EQ(-1, h264.nalus[0].pps_id);
 }
 
 }  // namespace webrtc