Remove EditingAppleTabSpan class handling

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 315 matching lines @@
     DocumentFonts = 440,
     MixedContentFormsSubmitted = 441,
     FormsSubmitted = 442,
     HTMLImports = 455,
     ElementCreateShadowRoot = 456,
     DocumentRegisterElement = 457,
     EditingAppleInterchangeNewline = 458,
     EditingAppleConvertedSpace = 459,
     EditingApplePasteAsQuotation = 460,
     EditingAppleStyleSpanClass = 461,
-    EditingAppleTabSpanClass = 462,
     HTMLImportsAsyncAttribute = 463,
     XMLHttpRequestSynchronous = 465,
     CSSSelectorPseudoUnresolved = 466,
     CSSSelectorPseudoShadow = 467,
     CSSSelectorPseudoContent = 468,
     CSSSelectorPseudoHost = 469,
     CSSSelectorPseudoHostContext = 470,
     CSSDeepCombinator = 471,
     // The above items are available in M37 branch.
 
@@ skipping 1231 matching lines @@
     // 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