Remove support for -webkit-canvas and Document.getCSSCanvasContext.

third_party/WebKit/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 306 matching lines @@
         PrefixedIDBKeyRangeConstructor = 367,
         PrefixedIDBObjectStoreConstructor = 368,
         PrefixedIDBRequestConstructor = 369,
         PrefixedIDBTransactionConstructor = 370,
         NotificationPermission = 371,
         RangeDetach = 372,
         PrefixedMouseEventMovementX = 382,
         PrefixedMouseEventMovementY = 383,
         PrefixedFileRelativePath = 386,
         DocumentCaretRangeFromPoint = 387,
-        DocumentGetCSSCanvasContext = 388,
+        // DocumentGetCSSCanvasContext = 388,
         ElementScrollIntoViewIfNeeded = 389,
         RangeExpand = 393,
         HTMLImageElementX = 396,
         HTMLImageElementY = 397,
         SelectionBaseNode = 400,
         SelectionBaseOffset = 401,
         SelectionExtentNode = 402,
         SelectionExtentOffset = 403,
         SelectionType = 404,
         SelectionModify = 405,
@@ skipping 619 matching lines @@
 
     bool hasRecordedMeasurement(Feature feature) const { return m_countBits.hasRecordedMeasurement(feature); }
 
     CountBits m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h