Remove EditingAppleTabSpan class handling

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple 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 1552 matching lines @@
   NOTREACHED();
   return nullptr;
 }
 
 HTMLElement* createHTMLElement(Document& document, const QualifiedName& name) {
   return HTMLElementFactory::createHTMLElement(name.localName(), document,
                                                CreatedByCloneNode);
 }
 
 bool isTabHTMLSpanElement(const Node* node) {
-  if (!isHTMLSpanElement(node) ||
-      toHTMLSpanElement(node)->getAttribute(classAttr) != AppleTabSpanClass)
+  if (!isHTMLSpanElement(node) || !node->firstChild())
     return false;
-  UseCounter::count(node->document(), UseCounter::EditingAppleTabSpanClass);
-  return true;
+  if (node->firstChild()->isCharacterDataNode() &&
+      toCharacterData(node->firstChild())->data().contains('\t'))
+    return true;
+  return false;
 }
 
 bool isTabHTMLSpanElementTextNode(const Node* node) {
   return node && node->isTextNode() && node->parentNode() &&
          isTabHTMLSpanElement(node->parentNode());
 }
 
 HTMLSpanElement* tabSpanElement(const Node* node) {
   return isTabHTMLSpanElementTextNode(node)
              ? toHTMLSpanElement(node->parentNode())
              : 0;
 }
 
 static HTMLSpanElement* createTabSpanElement(Document& document,
                                              Text* tabTextNode) {
   // Make the span to hold the tab.
   HTMLSpanElement* spanElement = HTMLSpanElement::create(document);
-  spanElement->setAttribute(classAttr, AppleTabSpanClass);
   spanElement->setAttribute(styleAttr, "white-space:pre");
 
   // Add tab text to that span.
   if (!tabTextNode)
     tabTextNode = document.createEditingTextNode("\t");
 
   spanElement->appendChild(tabTextNode);
 
   return spanElement;
 }
@@ skipping 565 matching lines @@
         return InputType::DeleteWordBackward;
       if (granularity == LineBoundary)
         return InputType::DeleteLineBackward;
       return InputType::DeleteContentBackward;
     default:
       return InputType::None;
   }
 }
 
 }  // namespace blink