Remove media::VideoDecodeContext as it has no implementation and is unused.

media/tools/player_x11/player_x11.cc

 // Copyright (c) 2011 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.
 
 #include <iostream>
 #include <signal.h>
 #include <X11/keysym.h>
 #include <X11/Xlib.h>
 
 #include "base/at_exit.h"
@@ skipping 74 matching lines @@
 
   // Create our filter factories.
   scoped_ptr<media::FilterCollection> collection(
       new media::FilterCollection());
   collection->SetDemuxerFactory(
       new media::FFmpegDemuxerFactory(
           new media::FileDataSourceFactory(), message_loop));
   collection->AddAudioDecoder(new media::FFmpegAudioDecoder(
       message_loop_factory->GetMessageLoop("AudioDecoderThread")));
   collection->AddVideoDecoder(new media::FFmpegVideoDecoder(
-      message_loop_factory->GetMessageLoop("VideoDecoderThread"),
-      NULL));
+      message_loop_factory->GetMessageLoop("VideoDecoderThread")));
 
   if (use_gl) {
     collection->AddVideoRenderer(
         new GlVideoRenderer(g_display, g_window, paint_message_loop));
   } else {
     collection->AddVideoRenderer(
         new X11VideoRenderer(g_display, g_window, paint_message_loop));
   }
 
   if (enable_audio)
@@ skipping 151 matching lines @@
   }
 
   // Cleanup tasks.
   message_loop_factory.reset();
 
   thread->Stop();
   XDestroyWindow(g_display, g_window);
   XCloseDisplay(g_display);
   return 0;
 }