Remove the fullscreen element stack exemption for webkitRequestFullScreen()

Source/core/frame/UseCounter.h

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 435 matching lines @@
         CSSSelectorPseudoHost = 469,
         CSSSelectorPseudoHostContext = 470,
         CSSDeepCombinator = 471,
         SyncXHRWithCredentials = 472,
         // The above items are available in M37 branch.
 
         UseAsm = 473,
         KeyEventNotAllowedInFullScreen = 474,
         DOMWindowOpen = 475,
         DOMWindowOpenFeatures = 476,
-        LegacyFullScreenErrorExemption = 477,
         MediaStreamTrackGetSources = 478,
         AspectRatioFlexItem = 479,
         DetailsElement = 480,
         DialogElement = 481,
         MapElement = 482,
         MeterElement = 483,
         ProgressElement = 484,
         VideoFullscreenAllowedExemption = 485,
         WebKitPoint = 488,
         PrefixedHTMLElementDropzone = 490,
@@ skipping 84 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h