Remove deprecated (and unused) method.

content/renderer/media/webrtc_audio_device_not_impl.cc

Index: content/renderer/media/webrtc_audio_device_not_impl.cc
diff --git a/content/renderer/media/webrtc_audio_device_not_impl.cc b/content/renderer/media/webrtc_audio_device_not_impl.cc
index dd16ddfc3d27357fb52dde6c904ec7a1decf5822..234bf87f7d33124111a4065e6ae4b3dfb6b8f70c 100644
--- a/content/renderer/media/webrtc_audio_device_not_impl.cc
+++ b/content/renderer/media/webrtc_audio_device_not_impl.cc
@@ -10,10 +10,6 @@ WebRtcAudioDeviceNotImpl::WebRtcAudioDeviceNotImpl()
     : last_process_time_(base::TimeTicks::Now()) {
 }
 
-int32_t WebRtcAudioDeviceNotImpl::ChangeUniqueId(const int32_t id) {
-  return 0;
-}
-
 int64_t WebRtcAudioDeviceNotImpl::TimeUntilNextProcess() {
   const int64_t kMillisecondsBetweenProcessCalls = 5000;
   base::TimeDelta delta_time = (base::TimeTicks::Now() - last_process_time_);