Avoid calling lower() on inline styles in parseKeywordValue.

third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSParserFastPaths.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSFunctionValue.h"
 #include "core/css/CSSValuePool.h"
 #include "core/css/parser/CSSParserIdioms.h"
@@ skipping 818 matching lines @@
         return false;
     }
 }
 
 static CSSValue* parseKeywordValue(CSSPropertyID propertyId, const String& string, CSSParserMode parserMode)
 {
     ASSERT(!string.isEmpty());
 
     if (!CSSParserFastPaths::isKeywordPropertyID(propertyId)) {
         // All properties accept the values of "initial" and "inherit".
-        String lowerCaseString = string.lower();
-        if (lowerCaseString != "initial" && lowerCaseString != "inherit")
+        if (!equalIgnoringASCIICase(string, "initial") && !equalIgnoringASCIICase(string, "inherit"))
             return nullptr;
 
         // Parse initial/inherit shorthands using the CSSPropertyParser.
         if (shorthandForProperty(propertyId).length())
             return nullptr;
     }
 
     CSSParserString cssString;
     cssString.init(string);
     CSSValueID valueID = cssValueKeywordID(cssString);
@@ skipping 177 matching lines @@
     if (isColorPropertyID(propertyID))
         return parseColor(string, parserMode);
     if (CSSValue* keyword = parseKeywordValue(propertyID, string, parserMode))
         return keyword;
     if (CSSValue* transform = parseSimpleTransform(propertyID, string))
         return transform;
     return nullptr;
 }
 
 } // namespace blink