CSSStyleDeclaration::setProperty should override important style

Source/core/css/parser/CSSParser.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 "config.h"
 #include "core/css/parser/CSSParser.h"
 
 #include "core/css/CSSKeyframeRule.h"
 #include "core/css/StyleColor.h"
 #include "core/css/StyleRule.h"
@@ skipping 46 matching lines @@
     BisonCSSParser(context).parseSheet(styleSheet, text, startPosition, observer, logErrors);
 }
 
 bool CSSParser::parseValue(MutableStylePropertySet* declaration, CSSPropertyID unresolvedProperty, const String& string, bool important, CSSParserMode parserMode, StyleSheetContents* styleSheet)
 {
     if (string.isEmpty())
         return false;
     CSSPropertyID resolvedProperty = resolveCSSPropertyID(unresolvedProperty);
     RefPtrWillBeRawPtr<CSSValue> value = CSSParserFastPaths::maybeParseValue(resolvedProperty, string, parserMode);
     if (value)
-        return declaration->addParsedProperty(CSSProperty(resolvedProperty, value.release(), important));
+        return declaration->setProperty(CSSProperty(resolvedProperty, value.release(), important));
     CSSParserContext context(parserMode, 0);
     if (styleSheet) {
         context = styleSheet->parserContext();
         context.setMode(parserMode);
     }
     return parseValue(declaration, unresolvedProperty, string, important, context);
 }
 
 bool CSSParser::parseValue(MutableStylePropertySet* declaration, CSSPropertyID unresolvedProperty, const String& string, bool important, const CSSParserContext& context)
 {
@@ skipping 92 matching lines @@
     CSSValueID id = cssValueKeywordID(cssColor);
     if (!CSSPropertyParser::isSystemColor(id))
         return false;
 
     Color parsedColor = LayoutTheme::theme().systemColor(id);
     color = parsedColor.rgb();
     return true;
 }
 
 } // namespace blink