diff --git a/api/audio_codecs/audio_encoder.h b/api/audio_codecs/audio_encoder.h
index 4e4c409815..7ad9ba4d09 100644
--- a/api/audio_codecs/audio_encoder.h
+++ b/api/audio_codecs/audio_encoder.h
@@ -24,7 +24,6 @@
 
 namespace webrtc {
 
-class Clock;
 class RtcEventLog;
 
 // Statistics related to Audio Network Adaptation.
diff --git a/media/engine/webrtcvideoengine.h b/media/engine/webrtcvideoengine.h
index f9c053a096..751dc4f6c0 100644
--- a/media/engine/webrtcvideoengine.h
+++ b/media/engine/webrtcvideoengine.h
@@ -65,8 +65,6 @@ class WebRtcVideoChannelSendInfo;
 class WebRtcVoiceEngine;
 class WebRtcVoiceMediaChannel;
 
-struct Device;
-
 class UnsignalledSsrcHandler {
  public:
   enum Action {