Revert of Deliver video frames on Android, on the decode thread.

webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 120 matching lines @@
   decoder_initialized_ = false;
   return decoder_->Release();
 }
 
 bool VideoDecoderSoftwareFallbackWrapper::PrefersLateDecoding() const {
   if (fallback_decoder_)
     return fallback_decoder_->PrefersLateDecoding();
   return decoder_->PrefersLateDecoding();
 }
 
-#if defined(WEBRTC_ANDROID)
-void VideoDecoderSoftwareFallbackWrapper::PollDecodedFrames() {
-  if (fallback_decoder_)
-    return fallback_decoder_->PollDecodedFrames();
-  return decoder_->PollDecodedFrames();
-}
-#endif
-
 const char* VideoDecoderSoftwareFallbackWrapper::ImplementationName() const {
   if (fallback_decoder_)
     return fallback_implementation_name_.c_str();
   return decoder_->ImplementationName();
 }
 
 }  // namespace webrtc