Prep to remove API-related #defines from voice_engine_configurations.h

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 03d69b4b8c4544c90bf07af4cdd6226b69f37d84..5ff82abe1bc4407a9bd6a95bcca080fcd47c6109 100644
--- a/webrtc/voice_engine/voe_video_sync_impl.cc
+++ b/webrtc/voice_engine/voe_video_sync_impl.cc
@@ -15,6 +15,10 @@
 #include "webrtc/voice_engine/include/voe_errors.h"
 #include "webrtc/voice_engine/voice_engine_impl.h"
 
+#ifndef WEBRTC_VOICE_ENGINE_VIDEO_SYNC_API
+#error "Deprecated"
+#endif
+
 namespace webrtc {
 
 VoEVideoSync* VoEVideoSync::GetInterface(VoiceEngine* voiceEngine) {