Remove untrusted event deprecation warning.

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 1095 matching lines @@
         CSSValueAppearanceTextField = 1362,
         AudioContextCreatePannerAutomated = 1363,
         PannerNodeSetPosition = 1364,
         PannerNodeSetOrientation = 1365,
         AudioListenerSetPosition = 1366,
         AudioListenerSetOrientation = 1367,
         IntersectionObserver_Constructor = 1368,
         DurableStoragePersist = 1369,
         DurableStoragePersisted = 1370,
         DurableStorageEstimate = 1371,
-        UntrustedEventDefaultHandled = 1372,
         CSSDeepCombinatorAndShadow = 1375,
         OpacityWithPreserve3DQuirk = 1376,
         CSSSelectorPseudoReadOnly = 1377,
         CSSSelectorPseudoReadWrite = 1378,
         // The above items are available in M52 branch
 
         TouchStartUserGestureUtilized = 1380,
         TouchMoveUserGestureUtilized = 1381,
         TouchEndDuringScrollUserGestureUtilized = 1382,
         CSSSelectorPseudoDefined = 1383,
@@ skipping 268 matching lines @@
     private:
         // Tracks what features/properties need to be reported to the legacy histograms.
         BitVector m_featureBits;
         BitVector m_CSSBits;
     } m_legacyCounter;
 };
 
 } // namespace blink
 
 #endif // UseCounter_h