Refactor MSE implementation on Android to simplify the logic and improve the performance

content/renderer/media/android/renderer_demuxer_android.cc

Index: content/renderer/media/android/renderer_demuxer_android.cc
diff --git a/content/renderer/media/android/renderer_demuxer_android.cc b/content/renderer/media/android/renderer_demuxer_android.cc
index ab139b5403e4ed62438421d1b115b865abd6b168..40ea5101d305d77164a3db197cf2f538eddc45cb 100644
--- a/content/renderer/media/android/renderer_demuxer_android.cc
+++ b/content/renderer/media/android/renderer_demuxer_android.cc
@@ -42,7 +42,6 @@ bool RendererDemuxerAndroid::OnMessageReceived(const IPC::Message& message) {
   switch (message.type()) {
     case MediaPlayerMsg_DemuxerSeekRequest::ID:
     case MediaPlayerMsg_ReadFromDemuxer::ID:
-    case MediaPlayerMsg_MediaConfigRequest::ID:
       media_message_loop_->PostTask(FROM_HERE, base::Bind(
           &RendererDemuxerAndroid::DispatchMessage, this, message));
       return true;
@@ -81,7 +80,6 @@ void RendererDemuxerAndroid::DispatchMessage(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(RendererDemuxerAndroid, message)
     IPC_MESSAGE_HANDLER(MediaPlayerMsg_DemuxerSeekRequest, OnDemuxerSeekRequest)
     IPC_MESSAGE_HANDLER(MediaPlayerMsg_ReadFromDemuxer, OnReadFromDemuxer)
-    IPC_MESSAGE_HANDLER(MediaPlayerMsg_MediaConfigRequest, OnMediaConfigRequest)
   IPC_END_MESSAGE_MAP()
 }
 
@@ -102,10 +100,4 @@ void RendererDemuxerAndroid::OnDemuxerSeekRequest(
     delegate->Seek(time_to_seek, is_browser_seek);
 }
 
-void RendererDemuxerAndroid::OnMediaConfigRequest(int demuxer_client_id) {
-  MediaSourceDelegate* delegate = delegates_.Lookup(demuxer_client_id);
-  if (delegate)
-    delegate->OnMediaConfigRequest();
-}
-
 }  // namespace content