Move a few media controls elements into modules/media_controls/elements/.

third_party/WebKit/Source/modules/media_controls/elements/MediaControlPanelEnclosureElement.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 MediaControlPanelEnclosureElement_h
+#define MediaControlPanelEnclosureElement_h
+
+#include "core/html/shadow/MediaControlElementTypes.h"
+
+namespace blink {
+
+class MediaControlsImpl;
+
+class MediaControlPanelEnclosureElement final : public MediaControlDivElement {
+ public:
+  explicit MediaControlPanelEnclosureElement(MediaControlsImpl&);
+};
+
+}  // namespace blink
+
+#endif  // MediaControlPanelEnclosureElement_h