Revert 96974 - Remove mock_ffmpeg and update media unittests.

media/base/media.h

Index: media/base/media.h
===================================================================
--- media/base/media.h	(revision 96976)
+++ media/base/media.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -25,11 +25,6 @@
 // Returns true if everything was successfully initialized, false otherwise.
 bool InitializeMediaLibrary(const FilePath& module_dir);
 
-// Helper function for unit tests to avoid boiler plate code everywhere. This
-// function will crash if it fails to load the media library. This ensures tests
-// fail if the media library is not available.
-void InitializeMediaLibraryForTesting();
-
 // Use this if you need to check whether the media library is initialized
 // for the this process, without actually trying to initialize it.
 bool IsMediaLibraryInitialized();