Replace scoped_ptr with unique_ptr in webrtc/voice_engine/

webrtc/voice_engine/voice_engine_impl.cc

Index: webrtc/voice_engine/voice_engine_impl.cc
diff --git a/webrtc/voice_engine/voice_engine_impl.cc b/webrtc/voice_engine/voice_engine_impl.cc
index d0b741207671141c95482c0f2c83d5fa1e2fb384..919d0e8efd34ded7d760b73a7fcea2667905f701 100644
--- a/webrtc/voice_engine/voice_engine_impl.cc
+++ b/webrtc/voice_engine/voice_engine_impl.cc
@@ -62,12 +62,12 @@ int VoiceEngineImpl::Release() {
   return new_ref;
 }
 
-rtc::scoped_ptr<voe::ChannelProxy> VoiceEngineImpl::GetChannelProxy(
+std::unique_ptr<voe::ChannelProxy> VoiceEngineImpl::GetChannelProxy(
     int channel_id) {
   RTC_DCHECK(channel_id >= 0);
   rtc::CritScope cs(crit_sec());
   RTC_DCHECK(statistics().Initialized());
-  return rtc::scoped_ptr<voe::ChannelProxy>(
+  return std::unique_ptr<voe::ChannelProxy>(
       new voe::ChannelProxy(channel_manager().GetChannel(channel_id)));
 }