Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/voe_volume_control_impl.cc

Index: webrtc/voice_engine/voe_volume_control_impl.cc
diff --git a/webrtc/voice_engine/voe_volume_control_impl.cc b/webrtc/voice_engine/voe_volume_control_impl.cc
index 0d79c6c6812616a64f5e80feedb27d727803aac2..878b68d14c3df9b8ea92a8b9a3922a40a2faa6db 100644
--- a/webrtc/voice_engine/voe_volume_control_impl.cc
+++ b/webrtc/voice_engine/voe_volume_control_impl.cc
@@ -20,8 +20,8 @@
 namespace webrtc {
 
 VoEVolumeControl* VoEVolumeControl::GetInterface(VoiceEngine* voiceEngine) {
-  if (NULL == voiceEngine) {
-    return NULL;
+  if (nullptr == voiceEngine) {
+    return nullptr;
   }
   VoiceEngineImpl* s = static_cast<VoiceEngineImpl*>(voiceEngine);
   s->AddRef();
@@ -204,7 +204,7 @@ int VoEVolumeControlImpl::SetInputMute(int channel, bool enable) {
   // Mute after demultiplexing <=> affects one channel only
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channelPtr = ch.channel();
-  if (channelPtr == NULL) {
+  if (channelPtr == nullptr) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "SetInputMute() failed to locate channel");
     return -1;
@@ -222,7 +222,7 @@ int VoEVolumeControlImpl::GetInputMute(int channel, bool& enabled) {
   } else {
     voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
     voe::Channel* channelPtr = ch.channel();
-    if (channelPtr == NULL) {
+    if (channelPtr == nullptr) {
       _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                             "SetInputMute() failed to locate channel");
       return -1;
@@ -253,7 +253,7 @@ int VoEVolumeControlImpl::GetSpeechOutputLevel(int channel,
   } else {
     voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
     voe::Channel* channelPtr = ch.channel();
-    if (channelPtr == NULL) {
+    if (channelPtr == nullptr) {
       _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                             "GetSpeechOutputLevel() failed to locate channel");
       return -1;
@@ -285,7 +285,7 @@ int VoEVolumeControlImpl::GetSpeechOutputLevelFullRange(int channel,
   } else {
     voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
     voe::Channel* channelPtr = ch.channel();
-    if (channelPtr == NULL) {
+    if (channelPtr == nullptr) {
       _shared->SetLastError(
           VE_CHANNEL_NOT_VALID, kTraceError,
           "GetSpeechOutputLevelFullRange() failed to locate channel");
@@ -312,7 +312,7 @@ int VoEVolumeControlImpl::SetChannelOutputVolumeScaling(int channel,
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channelPtr = ch.channel();
-  if (channelPtr == NULL) {
+  if (channelPtr == nullptr) {
     _shared->SetLastError(
         VE_CHANNEL_NOT_VALID, kTraceError,
         "SetChannelOutputVolumeScaling() failed to locate channel");
@@ -329,7 +329,7 @@ int VoEVolumeControlImpl::GetChannelOutputVolumeScaling(int channel,
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channelPtr = ch.channel();
-  if (channelPtr == NULL) {
+  if (channelPtr == nullptr) {
     _shared->SetLastError(
         VE_CHANNEL_NOT_VALID, kTraceError,
         "GetChannelOutputVolumeScaling() failed to locate channel");
@@ -371,7 +371,7 @@ int VoEVolumeControlImpl::SetOutputVolumePan(int channel,
   // Per-channel balance (affects the signal before output mixing)
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channelPtr = ch.channel();
-  if (channelPtr == NULL) {
+  if (channelPtr == nullptr) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "SetOutputVolumePan() failed to locate channel");
     return -1;
@@ -400,7 +400,7 @@ int VoEVolumeControlImpl::GetOutputVolumePan(int channel,
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channelPtr = ch.channel();
-  if (channelPtr == NULL) {
+  if (channelPtr == nullptr) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "GetOutputVolumePan() failed to locate channel");
     return -1;