Replace trampolining in FFmpegDemuxer with explicit thread calling convention checks.

media/base/bind_to_loop.h

 // This file was GENERATED by command:
 //     pump.py bind_to_loop.h.pump
 // DO NOT EDIT BY HAND!!!
 
 
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_BIND_TO_LOOP_H_
@@ skipping 146 matching lines @@
 template<typename T>
 static base::Callback<T> BindToLoop(
     const scoped_refptr<base::MessageLoopProxy>& loop,
     const base::Callback<T>& cb) {
   return base::Bind(&internal::TrampolineHelper<T>::Run, loop, cb);
 }
 
 template<typename T>
 static base::Callback<T> BindToCurrentLoop(
     const base::Callback<T>& cb) {
-  return base::Bind(&internal::TrampolineHelper<T>::Run,
-                    base::MessageLoopProxy::current(), cb);
+  return BindToLoop(base::MessageLoopProxy::current(), cb);
 }
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BIND_TO_LOOP_H_