Move Web-facing fullscreen APIs to DocumentFullscreen and ElementFullscreen

Source/core/dom/ElementFullscreen.idl

+// 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.
+
+partial interface Element {
+    // Mozilla version
+    const unsigned short ALLOW_KEYBOARD_INPUT = 1;
+    [LogActivity, LogAllWorlds, MeasureAs=PrefixedElementRequestFullScreen] void webkitRequestFullScreen([Default=Undefined] optional unsigned short flags);
+
+    // W3C version
+    [LogActivity, LogAllWorlds, MeasureAs=PrefixedElementRequestFullscreen] void webkitRequestFullscreen();
+
+    attribute EventHandler onwebkitfullscreenchange;
+    attribute EventHandler onwebkitfullscreenerror;
+};