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

webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc

Index: webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
diff --git a/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc b/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
index 9fb49520515c698d8927130c950a756a1992bc6c..34d851e0136d6ec12a1ec71a4fab9f1cf1409673 100644
--- a/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
+++ b/webrtc/media/engine/videodecodersoftwarefallbackwrapper.cc
@@ -138,14 +138,6 @@
   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();