hr color attribute not working.

Source/core/html/HTMLHRElement.cpp

Index: Source/core/html/HTMLHRElement.cpp
diff --git a/Source/core/html/HTMLHRElement.cpp b/Source/core/html/HTMLHRElement.cpp
index 7a6edf88eb51c5aeadaf83839ea9482c77a9624c..00f0cbde606c26f51df191bdb941bbcf8d0c6d75 100644
--- a/Source/core/html/HTMLHRElement.cpp
+++ b/Source/core/html/HTMLHRElement.cpp
@@ -76,11 +76,13 @@ void HTMLHRElement::collectStyleForPresentationAttribute(const QualifiedName& na
         addHTMLColorToStyle(style, CSSPropertyBorderColor, value);
         addHTMLColorToStyle(style, CSSPropertyBackgroundColor, value);
     } else if (name == noshadeAttr) {
-        addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderStyle, CSSValueSolid);
+        if (!hasAttribute(colorAttr)) {
+            addPropertyToPresentationAttributeStyle(style, CSSPropertyBorderStyle, CSSValueSolid);
 
-        RefPtr<CSSPrimitiveValue> darkGrayValue = cssValuePool().createColorValue(Color::darkGray);
-        style->setProperty(CSSPropertyBorderColor, darkGrayValue);
-        style->setProperty(CSSPropertyBackgroundColor, darkGrayValue);
+            RefPtr<CSSPrimitiveValue> darkGrayValue = cssValuePool().createColorValue(Color::darkGray);
+            style->setProperty(CSSPropertyBorderColor, darkGrayValue);
+            style->setProperty(CSSPropertyBackgroundColor, darkGrayValue);
+        }
     } else if (name == sizeAttr) {
         StringImpl* si = value.impl();
         int size = si->toInt();