Replace NULL with nullptr in all C++ files.

webrtc/voice_engine/voe_neteq_stats_impl.cc

Index: webrtc/voice_engine/voe_neteq_stats_impl.cc
diff --git a/webrtc/voice_engine/voe_neteq_stats_impl.cc b/webrtc/voice_engine/voe_neteq_stats_impl.cc
index 384292346bd126ae7c6675e5c70a5b713d4e8b8f..afb7529468e453c18ad7f3880cb70ecb7b788baf 100644
--- a/webrtc/voice_engine/voe_neteq_stats_impl.cc
+++ b/webrtc/voice_engine/voe_neteq_stats_impl.cc
@@ -19,8 +19,8 @@
 namespace webrtc {
 
 VoENetEqStats* VoENetEqStats::GetInterface(VoiceEngine* voiceEngine) {
-  if (NULL == voiceEngine) {
-    return NULL;
+  if (nullptr == voiceEngine) {
+    return nullptr;
   }
   VoiceEngineImpl* s = static_cast<VoiceEngineImpl*>(voiceEngine);
   s->AddRef();
@@ -46,7 +46,7 @@ int VoENetEqStatsImpl::GetNetworkStatistics(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,
                           "GetNetworkStatistics() failed to locate channel");
     return -1;
@@ -63,7 +63,7 @@ int VoENetEqStatsImpl::GetDecodingCallStatistics(
   }
   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,
                           "GetDecodingCallStatistics() failed to locate "
                           "channel");