Remove window.performance.webkitGet*

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 100 matching lines @@
         HTMLMarqueeElement = 53,
         Reflection = 55,
         PrefixedStorageInfo = 57,
         XFrameOptions = 58,
         XFrameOptionsSameOrigin = 59,
         XFrameOptionsSameOriginWithBadAncestorChain = 60,
         DeprecatedFlexboxWebContent = 61,
         DeprecatedFlexboxChrome = 62,
         DeprecatedFlexboxChromeExtension = 63,
         UnprefixedPerformanceTimeline = 65,
-        PrefixedPerformanceTimeline = 66,
         UnprefixedUserTiming = 67,
         WindowEvent = 69,
         ContentSecurityPolicyWithBaseElement = 70,
         PrefixedMediaAddKey = 71,
         PrefixedMediaGenerateKeyRequest = 72,
         DocumentClear = 74,
         SVGFontElement = 76,
         XMLDocument = 77,
         XSLProcessingInstruction = 78,
         XSLTProcessor = 79,
@@ skipping 283 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace WebCore
 
 #endif // UseCounter_h