Avoid calling lower() on inline styles in parseKeywordValue.

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

Index: third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
index 2fc2a0c8185e4acd717d354e62ad42e334ca5684..cb911a5d40600fb73b1c1f6574c0a2479051f8a7 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
@@ -836,8 +836,7 @@ static CSSValue* parseKeywordValue(CSSPropertyID propertyId, const String& strin
 
     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.