media: Cleanup class/struct forward declarations

media/base/media.h

 // 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.
 
 // Contains code that should be used for initializing, or querying the state
 // of the media library as a whole.
 
 #ifndef MEDIA_BASE_MEDIA_H_
 #define MEDIA_BASE_MEDIA_H_
 
 #include "build/build_config.h"
 #include "media/base/media_export.h"
 
-namespace base {
-class FilePath;
-}
-
 namespace media {
 
 // Initializes media libraries (e.g. ffmpeg) as well as CPU specific media
 // features.
 MEDIA_EXPORT void InitializeMediaLibrary();
 
 #if defined(OS_ANDROID)
 // Tells the media library it has support for OS level decoders. Should only be
 // used for actual decoders (e.g. MediaCodec) and not full-featured players
 // (e.g. MediaPlayer).
@@ skipping 15 matching lines @@
 // Returns whether the platform decoders are available for use.
 // This includes decoders being available on the platform and accessible, such
 // as via the GPU process. Should only be used for actual decoders
 // (e.g. MediaCodec) and not full-featured players (e.g. MediaPlayer).
 MEDIA_EXPORT bool ArePlatformDecodersAvailable();
 #endif
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_MEDIA_H_