Use ASCII-caseless matching for attribute names.

third_party/WebKit/Source/platform/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 279 matching lines @@
   // These functions are rarely used to implement web platform features. See
   // crbug.com/627682.
   // These functions are deprecated. We should use UpperASCII(), or introduce
   // UpperUnicode(), and should introduce LowerASCII() or LowerUnicode().
   String DeprecatedLower() const;
   String DeprecatedUpper() const;
 
   String LowerUnicode(const AtomicString& locale_identifier) const;
   String UpperUnicode(const AtomicString& locale_identifier) const;
 
+  // Returns a lowercase version of the string.
+  // This function converts ASCII characters only.
+  String LowerASCII() 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 = kStripExtraWhiteSpace) const;
   String SimplifyWhiteSpace(IsWhiteSpaceFunctionPtr,
                             StripBehavior = kStripExtraWhiteSpace) const;
 
@@ skipping 155 matching lines @@
 inline bool operator!=(const String& a, const String& b) {
   return !(a == b);
 }
 inline bool operator!=(const String& a, const char* b) {
   return !(a == b);
 }
 inline bool operator!=(const char* a, const String& b) {
   return !(a == b);
 }
 
-inline bool EqualPossiblyIgnoringCase(const String& a,
-                                      const String& b,
-                                      bool ignore_case) {
-  return ignore_case ? DeprecatedEqualIgnoringCase(a, b) : (a == b);
+inline bool EqualPossiblyIgnoringASCIICase(const String& a,
+                                           const String& b,
+                                           bool ignore_case) {
+  return ignore_case ? EqualIgnoringASCIICase(a, b) : (a == b);
 }
 
 inline bool EqualIgnoringNullity(const String& a, const String& b) {
   return EqualIgnoringNullity(a.Impl(), b.Impl());
 }
 
 template <size_t inlineCapacity>
 inline bool EqualIgnoringNullity(const Vector<UChar, inlineCapacity>& a,
                                  const String& b) {
   return EqualIgnoringNullity(a, b.Impl());
@@ skipping 112 matching lines @@
 using WTF::String;
 using WTF::g_empty_string;
 using WTF::g_empty_string16_bit;
 using WTF::CharactersAreAllASCII;
 using WTF::Equal;
 using WTF::Find;
 using WTF::IsSpaceOrNewline;
 
 #include "wtf/text/AtomicString.h"
 #endif  // WTFString_h