Revert of media: Add MediaOzonePlatform support

media/ozone/media_ozone_platform.h

-// Copyright 2014 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_OZONE_MEDIA_OZONE_PLATFORM_H_
-#define MEDIA_OZONE_MEDIA_OZONE_PLATFORM_H_
-
-#include "base/callback.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-class VideoDecodeAccelerator;
-
-// Class for Ozone platform media implementations. Note that the base class for
-// Ozone platform is at ui/ozone.
-//
-// Ozone platforms must override this class and implement the virtual
-// GetFooFactoryOzone() methods to provide implementations of the
-// various ozone interfaces.
-class MEDIA_EXPORT MediaOzonePlatform {
- public:
-  MediaOzonePlatform();
-  virtual ~MediaOzonePlatform();
-
-  // Besides get the global instance, initializes the subsystems/resources
-  // necessary for media also.
-  static MediaOzonePlatform* GetInstance();
-
-  // Factory getters to override in subclasses. The returned objects will be
-  // injected into the appropriate layer at startup. Subclasses should not
-  // inject these objects themselves. Ownership is retained by
-  // MediaOzonePlatform.
-  virtual VideoDecodeAccelerator* CreateVideoDecodeAccelerator(
-      const base::Callback<bool(void)>& make_context_current);
-
- private:
-  static void CreateInstance();
-
-  static MediaOzonePlatform* instance_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaOzonePlatform);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_OZONE_MEDIA_OZONE_PLATFORM_H_