Media Capabilities: rename mediacapabilities module to media_capabilities.

third_party/WebKit/Source/modules/mediacapabilities/MediaDecodingAbility.h

-// Copyright 2017 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 MediaDecodingAbility_h
-#define MediaDecodingAbility_h
-
-#include "bindings/core/v8/ScriptWrappable.h"
-
-namespace blink {
-
-// Implementation of the MediaDecodingAbility interface.
-class MediaDecodingAbility final
-    : public GarbageCollected<MediaDecodingAbility>,
-      public ScriptWrappable {
-  DEFINE_WRAPPERTYPEINFO();
-
- public:
-  MediaDecodingAbility();
-
-  bool supported() const;
-  bool smooth() const;
-  bool powerEfficient() const;
-
-  DECLARE_VIRTUAL_TRACE();
-};
-
-}  // namespace blink
-
-#endif  // MediaDecodingAbility_h