Consistently cache ElementData::length() before loops

Source/core/page/PageSerializer.cpp

 /*
  * Copyright (C) 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
 static bool isCharsetSpecifyingNode(const Node& node)
 {
     if (!node.isHTMLElement())
         return false;
 
     const HTMLElement& element = toHTMLElement(node);
     if (!element.hasTagName(HTMLNames::metaTag))
         return false;
     HTMLAttributeList attributes;
     if (element.hasAttributes()) {
-        for (unsigned i = 0; i < element.attributeCount(); ++i) {
+        unsigned attributeCount = element.attributeCount();
+        for (unsigned i = 0; i < attributeCount; ++i) {
             const Attribute* attribute = element.attributeItem(i);
             // FIXME: We should deal appropriately with the attribute if they have a namespace.
             attributes.append(std::make_pair(attribute->name().localName(), attribute->value().string()));
         }
     }
     WTF::TextEncoding textEncoding = encodingFromMetaAttributes(attributes);
     return textEncoding.isValid();
 }
 
 static bool shouldIgnoreElement(const Element& element)
@@ skipping 287 matching lines @@
     if (iter != m_blankFrameURLs.end())
         return iter->value;
     String url = "wyciwyg://frame/" + String::number(m_blankFrameCounter++);
     KURL fakeURL(ParsedURLString, url);
     m_blankFrameURLs.add(frame, fakeURL);
 
     return fakeURL;
 }
 
 }