Remove custom element :unresolved.

sky/engine/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 322 matching lines @@
         ElementCreateShadowRoot = 456,
         DocumentRegisterElement = 457,
         EditingAppleInterchangeNewline = 458,
         EditingAppleConvertedSpace = 459,
         EditingApplePasteAsQuotation = 460,
         EditingAppleStyleSpanClass = 461,
         EditingAppleTabSpanClass = 462,
         HTMLImportsAsyncAttribute = 463,
         FontFaceSetReady = 464,
 
-        CSSSelectorPseudoUnresolved = 466,
-
         CSSSelectorPseudoHost = 469,
 
         CSSDeepCombinator = 471,
         SyncXHRWithCredentials = 472,
         // The above items are available in M37 branch.
 
         UseAsm = 473,
         KeyEventNotAllowedInFullScreen = 474,
         DOMWindowOpen = 475,
         DOMWindowOpenFeatures = 476,
@@ skipping 96 matching lines @@
 
     void updateMeasurements();
 
     OwnPtr<BitVector> m_countBits;
     BitVector m_CSSFeatureBits;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_FRAME_USECOUNTER_H_