Remove EditingAppleTabSpan class handling

third_party/WebKit/Source/core/editing/commands/ReplaceSelectionCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 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
@@ skipping 979 matching lines @@
   if (isEnclosingBlock(node))
     return false;
 
   if (!node->isHTMLElement())
     return false;
 
   // We can skip over elements whose class attribute is
   // one of our internal classes.
   const HTMLElement* element = toHTMLElement(node);
   const AtomicString& classAttributeValue = element->getAttribute(classAttr);
-  if (classAttributeValue == AppleTabSpanClass) {
-    UseCounter::count(element->document(),
-                      UseCounter::EditingAppleTabSpanClass);
-    return true;
-  }
   if (classAttributeValue == AppleConvertedSpace) {
     UseCounter::count(element->document(),
                       UseCounter::EditingAppleConvertedSpace);
     return true;
   }
 
   return EditingStyle::elementIsStyledSpanOrHTMLEquivalent(element);
 }
 
 static inline HTMLElement*
@@ skipping 998 matching lines @@
   visitor->trace(m_startOfInsertedContent);
   visitor->trace(m_endOfInsertedContent);
   visitor->trace(m_insertionStyle);
   visitor->trace(m_documentFragment);
   visitor->trace(m_startOfInsertedRange);
   visitor->trace(m_endOfInsertedRange);
   CompositeEditCommand::trace(visitor);
 }
 
 }  // namespace blink