Media Controls: move time display elements to media_controls module.

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