Replace NULL with nullptr in all C++ files.

webrtc/modules/audio_device/audio_device_impl.cc

Index: webrtc/modules/audio_device/audio_device_impl.cc
diff --git a/webrtc/modules/audio_device/audio_device_impl.cc b/webrtc/modules/audio_device/audio_device_impl.cc
index ad643e9684688a5ae9cf641364bdd3425f31a817..bd55db2f779dc5ceb359649a7d01cd5266911a2f 100644
--- a/webrtc/modules/audio_device/audio_device_impl.cc
+++ b/webrtc/modules/audio_device/audio_device_impl.cc
@@ -122,8 +122,8 @@ AudioDeviceModuleImpl::AudioDeviceModuleImpl(const int32_t id,
     : _critSect(*CriticalSectionWrapper::CreateCriticalSection()),
       _critSectEventCb(*CriticalSectionWrapper::CreateCriticalSection()),
       _critSectAudioCb(*CriticalSectionWrapper::CreateCriticalSection()),
-      _ptrCbAudioDeviceObserver(NULL),
-      _ptrAudioDevice(NULL),
+      _ptrCbAudioDeviceObserver(nullptr),
+      _ptrAudioDevice(nullptr),
       _id(id),
       _platformAudioLayer(audioLayer),
       _lastProcessTime(rtc::TimeMillis()),
@@ -181,7 +181,7 @@ int32_t AudioDeviceModuleImpl::CheckPlatform() {
 int32_t AudioDeviceModuleImpl::CreatePlatformSpecificObjects() {
   LOG(INFO) << __FUNCTION__;
 
-  AudioDeviceGeneric* ptrAudioDevice(NULL);
+  AudioDeviceGeneric* ptrAudioDevice(nullptr);
 
 #if defined(WEBRTC_DUMMY_AUDIO_BUILD)
   ptrAudioDevice = new AudioDeviceDummy(Id());
@@ -223,7 +223,7 @@ int32_t AudioDeviceModuleImpl::CreatePlatformSpecificObjects() {
     } else {
       // create *Windows Wave Audio* implementation
       ptrAudioDevice = new AudioDeviceWindowsWave(Id());
-      if (ptrAudioDevice != NULL) {
+      if (ptrAudioDevice != nullptr) {
         // Core Audio was not supported => revert to Windows Wave instead
         _platformAudioLayer =
             kWindowsWaveAudio;  // modify the state set at construction
@@ -295,7 +295,7 @@ int32_t AudioDeviceModuleImpl::CreatePlatformSpecificObjects() {
 #if defined(LINUX_ALSA)
       // create *Linux ALSA Audio* implementation
       ptrAudioDevice = new AudioDeviceLinuxALSA(Id());
-      if (ptrAudioDevice != NULL) {
+      if (ptrAudioDevice != nullptr) {
         // Pulse Audio was not supported => revert to ALSA instead
         _platformAudioLayer =
             kLinuxAlsaAudio;  // modify the state set at construction
@@ -346,7 +346,7 @@ int32_t AudioDeviceModuleImpl::CreatePlatformSpecificObjects() {
   }
 #endif  // if defined(WEBRTC_DUMMY_AUDIO_BUILD)
 
-  if (ptrAudioDevice == NULL) {
+  if (ptrAudioDevice == nullptr) {
     LOG(LERROR)
         << "unable to create the platform specific audio device implementation";
     return -1;
@@ -384,7 +384,7 @@ AudioDeviceModuleImpl::~AudioDeviceModuleImpl() {
 
   if (_ptrAudioDevice) {
     delete _ptrAudioDevice;
-    _ptrAudioDevice = NULL;
+    _ptrAudioDevice = nullptr;
   }
 
   delete &_critSect;
@@ -1252,7 +1252,7 @@ int32_t AudioDeviceModuleImpl::PlayoutDeviceName(
   LOG(INFO) << __FUNCTION__ << "(" << index << ", ...)";
   CHECK_INITIALIZED();
 
-  if (name == NULL) {
+  if (name == nullptr) {
     _lastError = kAdmErrArgument;
     return -1;
   }
@@ -1261,10 +1261,10 @@ int32_t AudioDeviceModuleImpl::PlayoutDeviceName(
     return -1;
   }
 
-  if (name != NULL) {
+  if (name != nullptr) {
     LOG(INFO) << "output: name = " << name;
   }
-  if (guid != NULL) {
+  if (guid != nullptr) {
     LOG(INFO) << "output: guid = " << guid;
   }
 
@@ -1282,7 +1282,7 @@ int32_t AudioDeviceModuleImpl::RecordingDeviceName(
   LOG(INFO) << __FUNCTION__ << "(" << index << ", ...)";
   CHECK_INITIALIZED();
 
-  if (name == NULL) {
+  if (name == nullptr) {
     _lastError = kAdmErrArgument;
     return -1;
   }
@@ -1291,10 +1291,10 @@ int32_t AudioDeviceModuleImpl::RecordingDeviceName(
     return -1;
   }
 
-  if (name != NULL) {
+  if (name != nullptr) {
     LOG(INFO) << "output: name = " << name;
   }
-  if (guid != NULL) {
+  if (guid != nullptr) {
     LOG(INFO) << "output: guid = " << guid;
   }
 
@@ -1508,7 +1508,7 @@ int32_t AudioDeviceModuleImpl::StartRawInputFileRecording(
   LOG(INFO) << __FUNCTION__;
   CHECK_INITIALIZED();
 
-  if (NULL == pcmFileNameUTF8) {
+  if (nullptr == pcmFileNameUTF8) {
     return -1;
   }
 
@@ -1535,7 +1535,7 @@ int32_t AudioDeviceModuleImpl::StartRawOutputFileRecording(
   LOG(INFO) << __FUNCTION__;
   CHECK_INITIALIZED();
 
-  if (NULL == pcmFileNameUTF8) {
+  if (nullptr == pcmFileNameUTF8) {
     return -1;
   }