Removed |which| from KeyboardEvent and MouseEvent.

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 419 matching lines @@
     kCSSSelectorPseudoScrollbarTrackPiece = 586,
     kLangAttribute = 587,
     kLangAttributeOnHTML = 588,
     kLangAttributeOnBody = 589,
     kLangAttributeDoesNotMatchToUILocale = 590,
     kInputTypeSubmit = 591,
     kInputTypeSubmitWithValue = 592,
     // The above items are available in M40 branch.
 
     kSetReferrerPolicy = 593,
-    kMouseEventWhich = 595,
-    kUIEventWhich = 598,
     kTextWholeText = 599,
     kNotificationCloseEvent = 603,
     kStyleMedia = 606,
     kStyleMediaType = 607,
     kStyleMediaMatchMedium = 608,
     kMixedContentPresent = 609,
     kMixedContentBlockable = 610,
     kMixedContentAudio = 611,
     kMixedContentDownload = 612,
     kMixedContentFavicon = 613,
@@ skipping 1261 matching lines @@
     // Tracks what features/properties need to be reported to the legacy
     // histograms.
     BitVector feature_bits_;
     BitVector css_bits_;
   } legacy_counter_;
 };
 
 }  // namespace blink
 
 #endif  // UseCounter_h