Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_device/android/opensles_recorder.cc

 /*
  *  Copyright (c) 2016 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 212 matching lines @@
   ALOGD("CreateAudioRecorder");
   RTC_DCHECK(thread_checker_.CalledOnValidThread());
   if (recorder_object_.Get())
     return true;
   RTC_DCHECK(!recorder_);
   RTC_DCHECK(!simple_buffer_queue_);
 
   // Audio source configuration.
   SLDataLocator_IODevice mic_locator = {SL_DATALOCATOR_IODEVICE,
                                         SL_IODEVICE_AUDIOINPUT,
-                                        SL_DEFAULTDEVICEID_AUDIOINPUT, NULL};
-  SLDataSource audio_source = {&mic_locator, NULL};
+                                        SL_DEFAULTDEVICEID_AUDIOINPUT, nullptr};
+  SLDataSource audio_source = {&mic_locator, nullptr};
 
   // Audio sink configuration.
   SLDataLocator_AndroidSimpleBufferQueue buffer_queue = {
       SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,
       static_cast<SLuint32>(kNumOfOpenSLESBuffers)};
   SLDataSink audio_sink = {&buffer_queue, &pcm_format_};
 
   // Create the audio recorder object (requires the RECORD_AUDIO permission).
   // Do not realize the recorder yet. Set the configuration first.
   const SLInterfaceID interface_id[] = {SL_IID_ANDROIDSIMPLEBUFFERQUEUE,
@@ skipping 172 matching lines @@
   SLAndroidSimpleBufferQueueState state = GetBufferQueueState();
   ALOGD("state.count:%d state.index:%d", state.count, state.index);
 }
 
 SLuint32 OpenSLESRecorder::GetBufferCount() {
   SLAndroidSimpleBufferQueueState state = GetBufferQueueState();
   return state.count;
 }
 
 }  // namespace webrtc