Create core/html/media/ and move auxiliary media files in it.

third_party/WebKit/Source/core/html/HTMLMediaElementControlsList.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 HTMLMediaElementControlsList_h
-#define HTMLMediaElementControlsList_h
-
-#include "core/dom/DOMTokenList.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class HTMLMediaElement;
-
-class HTMLMediaElementControlsList final : public DOMTokenList,
-                                           public DOMTokenListObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(HTMLMediaElementControlsList);
-
- public:
-  static HTMLMediaElementControlsList* create(HTMLMediaElement* element) {
-    return new HTMLMediaElementControlsList(element);
-  }
-
-  ~HTMLMediaElementControlsList() override;
-
-  DECLARE_VIRTUAL_TRACE();
-
-  // Whether the list dictates to hide a certain control.
-  bool shouldHideDownload() const;
-  bool shouldHideFullscreen() const;
-  bool shouldHideRemotePlayback() const;
-
- private:
-  explicit HTMLMediaElementControlsList(HTMLMediaElement*);
-  bool validateTokenValue(const AtomicString&, ExceptionState&) const override;
-
-  // DOMTokenListObserver.
-  void valueWasSet() override;
-
-  Member<HTMLMediaElement> m_element;
-};
-
-}  // namespace blink
-
-#endif