Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_processing/transient/transient_suppression_test.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.
  */
 
@@ skipping 129 matching lines @@
 
 // This application tests the transient suppression by providing a processed
 // PCM file, which has to be listened to in order to evaluate the
 // performance.
 // It gets an audio file, and its voice gain information, and the suppressor
 // process it giving the output file "suppressed_keystrokes.pcm".
 void void_main() {
   // TODO(aluebs): Remove all FileWrappers.
   // Prepare the input file.
   FILE* in_file = fopen(FLAGS_in_file_name.c_str(), "rb");
-  ASSERT_TRUE(in_file != NULL);
+  ASSERT_TRUE(in_file != nullptr);
 
   // Prepare the detection file.
-  FILE* detection_file = NULL;
+  FILE* detection_file = nullptr;
   if (!FLAGS_detection_file_name.empty()) {
     detection_file = fopen(FLAGS_detection_file_name.c_str(), "rb");
   }
 
   // Prepare the reference file.
-  FILE* reference_file = NULL;
+  FILE* reference_file = nullptr;
   if (!FLAGS_reference_file_name.empty()) {
     reference_file = fopen(FLAGS_reference_file_name.c_str(), "rb");
   }
 
   // Prepare the output file.
   std::string out_file_name = test::OutputPath() + "suppressed_keystrokes.pcm";
   FILE* out_file = fopen(out_file_name.c_str(), "wb");
-  ASSERT_TRUE(out_file != NULL);
+  ASSERT_TRUE(out_file != nullptr);
 
   int detection_rate_hz = FLAGS_detection_rate_hz;
   if (detection_rate_hz == 0) {
     detection_rate_hz = FLAGS_sample_rate_hz;
   }
 
   Agc agc;
 
   TransientSuppressor suppressor;
   suppressor.Initialize(
@@ skipping 64 matching lines @@
 }
 
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   google::SetUsageMessage(webrtc::kUsage);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::void_main();
   return 0;
 }