Optimize hasTagName when called on an HTMLElement / SVGElement

Source/core/editing/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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 47 matching lines @@
 {
     DEFINE_STATIC_LOCAL(String, styleSpanClassString, ((AppleStyleSpanClass)));
     return styleSpanClassString;
 }
 
 bool isLegacyAppleStyleSpan(const Node *node)
 {
     if (!node || !node->isHTMLElement())
         return false;
 
-    const HTMLElement* elem = toHTMLElement(node);
-    if (!elem->hasLocalName(spanAttr) || elem->getAttribute(classAttr) != styleSpanClassString())
+    const HTMLElement& element = toHTMLElement(*node);
+    if (!isHTMLSpanElement(element) || element.getAttribute(classAttr) != styleSpanClassString())
         return false;
-    UseCounter::count(elem->document(), UseCounter::EditingAppleStyleSpanClass);
+    UseCounter::count(element.document(), UseCounter::EditingAppleStyleSpanClass);
     return true;
 }
 
 static bool hasNoAttributeOrOnlyStyleAttribute(const Element* element, ShouldStyleAttributeBeEmpty shouldStyleAttributeBeEmpty)
 {
     if (!element->hasAttributes())
         return true;
 
     unsigned matchedAttributes = 0;
     if (element->getAttribute(classAttr) == styleSpanClassString())
@@ skipping 1490 matching lines @@
 void ApplyStyleCommand::trace(Visitor* visitor)
 {
     visitor->trace(m_style);
     visitor->trace(m_start);
     visitor->trace(m_end);
     visitor->trace(m_styledInlineElement);
     CompositeEditCommand::trace(visitor);
 }
 
 }