Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_coding/test/TestRedFec.cc

 /*
  *  Copyright (c) 2012 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 33 matching lines @@
 #ifdef WEBRTC_CODEC_G722
   const char kNameISAC[] = "ISAC";
   const char kNameG722[] = "G722";
   const char kNameOPUS[] = "opus";
 #endif
 }
 
 TestRedFec::TestRedFec()
     : _acmA(AudioCodingModule::Create(0)),
       _acmB(AudioCodingModule::Create(1)),
-      _channelA2B(NULL),
-      _testCntr(0) {
-}
+      _channelA2B(nullptr),
+      _testCntr(0) {}
 
 TestRedFec::~TestRedFec() {
-  if (_channelA2B != NULL) {
+  if (_channelA2B != nullptr) {
     delete _channelA2B;
-    _channelA2B = NULL;
+    _channelA2B = nullptr;
   }
 }
 
 void TestRedFec::Perform() {
   const std::string file_name = webrtc::test::ResourcePath(
       "audio_coding/testfile32kHz", "pcm");
   _inFileA.Open(file_name, 32000, "rb");
 
   ASSERT_EQ(0, _acmA->InitializeReceiver());
   ASSERT_EQ(0, _acmB->InitializeReceiver());
@@ skipping 359 matching lines @@
       break;
     }
     case 'B': {
       myACM = _acmB.get();
       break;
     }
     default:
       return -1;
   }
 
-  if (myACM == NULL) {
+  if (myACM == nullptr) {
     assert(false);
     return -1;
   }
   CodecInst myCodecParam;
   EXPECT_GT(AudioCodingModule::Codec(codecName, &myCodecParam,
                                      samplingFreqHz, 1), -1);
   EXPECT_GT(myACM->RegisterSendCodec(myCodecParam), -1);
 
   // Initialization was successful.
   return 0;
@@ skipping 22 matching lines @@
   std::string file_name;
   std::stringstream file_stream;
   file_stream << webrtc::test::OutputPath();
   file_stream << "TestRedFec_outFile_";
   file_stream << test_number << ".pcm";
   file_name = file_stream.str();
   _outFileB.Open(file_name, 16000, "wb");
 }
 
 }  // namespace webrtc