Reland of Add support for device-change notifications to MediaStreamDispatcher

content/renderer/media/user_media_client_impl.cc

Index: content/renderer/media/user_media_client_impl.cc
diff --git a/content/renderer/media/user_media_client_impl.cc b/content/renderer/media/user_media_client_impl.cc
index c8f32b1009a8bbbfa905494ffb20de38d48449d5..37cd741d07603df129ed0cd98dab289bbc68c0c2 100644
--- a/content/renderer/media/user_media_client_impl.cc
+++ b/content/renderer/media/user_media_client_impl.cc
@@ -774,6 +774,11 @@ void UserMediaClientImpl::OnDeviceOpenFailed(int request_id) {
   NOTIMPLEMENTED();
 }
 
+void UserMediaClientImpl::OnDevicesChanged() {
+  DVLOG(1) << "UserMediaClientImpl::OnDevicesChanged()";
+  NOTIMPLEMENTED();
+}
+
 void UserMediaClientImpl::GetUserMediaRequestSucceeded(
     const blink::WebMediaStream& stream,
     blink::WebUserMediaRequest request_info) {