Use the correct case converter for |localName| and |tagName|

third_party/WebKit/Source/wtf/text/WTFString.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 275 matching lines @@
   // Returns a lowercase/uppercase version of the string. These functions might
   // convert non-ASCII characters to ASCII characters. For example, lower() for
   // U+212A is 'k', upper() for U+017F is 'S'.
   // These functions are rarely used to implement web platform features.
   String lower() const;
   String upper() const;
 
   String lower(const AtomicString& localeIdentifier) const;
   String upper(const AtomicString& localeIdentifier) const;
 
+  // Returns a uppercase version of the string.
+  // This function converts ASCII characters only.
+  String upperASCII() const;
+
   String stripWhiteSpace() const;
   String stripWhiteSpace(IsWhiteSpaceFunctionPtr) const;
   String simplifyWhiteSpace(StripBehavior = StripExtraWhiteSpace) const;
   String simplifyWhiteSpace(IsWhiteSpaceFunctionPtr,
                             StripBehavior = StripExtraWhiteSpace) const;
 
   String removeCharacters(CharacterMatchFunctionPtr) const;
   template <bool isSpecialCharacter(UChar)>
   bool isAllSpecialCharacters() const;
 
@@ skipping 287 matching lines @@
 using WTF::String;
 using WTF::emptyString;
 using WTF::emptyString16Bit;
 using WTF::charactersAreAllASCII;
 using WTF::equal;
 using WTF::find;
 using WTF::isSpaceOrNewline;
 
 #include "wtf/text/AtomicString.h"
 #endif  // WTFString_h