Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/voe_video_sync_impl.cc

Index: webrtc/voice_engine/voe_video_sync_impl.cc
diff --git a/webrtc/voice_engine/voe_video_sync_impl.cc b/webrtc/voice_engine/voe_video_sync_impl.cc
index e82cbb3b5eacd1c76890f4422e0a5dc834cecd9a..c8781055ee4e991928a8fc6c42e8fb857f8a1225 100644
--- a/webrtc/voice_engine/voe_video_sync_impl.cc
+++ b/webrtc/voice_engine/voe_video_sync_impl.cc
@@ -18,8 +18,8 @@
 namespace webrtc {
 
 VoEVideoSync* VoEVideoSync::GetInterface(VoiceEngine* voiceEngine) {
-  if (NULL == voiceEngine) {
-    return NULL;
+  if (nullptr == voiceEngine) {
+    return nullptr;
   }
   VoiceEngineImpl* s = static_cast<VoiceEngineImpl*>(voiceEngine);
   s->AddRef();
@@ -44,7 +44,7 @@ int VoEVideoSyncImpl::GetPlayoutTimestamp(int channel,
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channel_ptr = ch.channel();
-  if (channel_ptr == NULL) {
+  if (channel_ptr == nullptr) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "GetPlayoutTimestamp() failed to locate channel");
     return -1;
@@ -63,7 +63,7 @@ int VoEVideoSyncImpl::SetInitTimestamp(int channel, unsigned int timestamp) {
   }
   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,
                           "SetInitTimestamp() failed to locate channel");
     return -1;
@@ -82,7 +82,7 @@ int VoEVideoSyncImpl::SetInitSequenceNumber(int channel, short sequenceNumber) {
   }
   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,
                           "SetInitSequenceNumber() failed to locate channel");
     return -1;
@@ -101,7 +101,7 @@ int VoEVideoSyncImpl::SetMinimumPlayoutDelay(int channel, int delayMs) {
   }
   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,
                           "SetMinimumPlayoutDelay() failed to locate channel");
     return -1;
@@ -118,7 +118,7 @@ int VoEVideoSyncImpl::GetDelayEstimate(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,
                           "GetDelayEstimate() failed to locate channel");
     return -1;
@@ -155,7 +155,7 @@ int VoEVideoSyncImpl::GetRtpRtcp(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,
                           "GetPlayoutTimestamp() failed to locate channel");
     return -1;
@@ -170,7 +170,7 @@ int VoEVideoSyncImpl::GetLeastRequiredDelayMs(int channel) const {
   }
   voe::ChannelOwner ch = _shared->channel_manager().GetChannel(channel);
   voe::Channel* channel_ptr = ch.channel();
-  if (channel_ptr == NULL) {
+  if (channel_ptr == nullptr) {
     _shared->SetLastError(VE_CHANNEL_NOT_VALID, kTraceError,
                           "GetLeastRequiredDelayMs() failed to locate channel");
     return -1;