Remove mock_ffmpeg and update media unittests.

media/base/media_win.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 "media/base/media.h"
 
 #include <windows.h>
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 60 matching lines @@
     // Free any loaded libraries if we weren't successful.
     for (size_t i = 0; i < arraysize(libs) && libs[i] != NULL; ++i) {
       FreeLibrary(libs[i]);
       libs[i] = NULL;  // Just to be safe.
     }
   }
 
   return g_media_library_is_initialized;
 }
 
+bool InitializeMediaLibraryForTesting() {
+  FilePath file_path;
+  if (!PathService::Get(base::DIR_SOURCE_ROOT, &file_path))
+    return false;
+  return InitializeMediaLibrary(file_path);
+}
+
 bool IsMediaLibraryInitialized() {
   return g_media_library_is_initialized;
 }
 
 bool InitializeOpenMaxLibrary(const FilePath& module_dir) {
   NOTIMPLEMENTED() << "OpenMAX is not used in Windows.";
   return false;
 }
 
 }  // namespace media