Revert r154797: "Move isValid/isCurrentColor from Color to StyleColor"

Source/core/html/HTMLElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 1045 matching lines @@
     if (attributeValue.isEmpty())
         return;
 
     String colorString = attributeValue.stripWhiteSpace();
 
     // "transparent" doesn't apply a color either.
     if (equalIgnoringCase(colorString, "transparent"))
         return;
 
     // If the string is a named CSS color or a 3/6-digit hex color, use that.
-    StyleColor parsedColor(colorString);
+    Color parsedColor(colorString);
     if (!parsedColor.isValid())
-        parsedColor = parseColorStringWithCrazyLegacyRules(colorString);
+        parsedColor.setRGB(parseColorStringWithCrazyLegacyRules(colorString));
 
     style->setProperty(propertyID, cssValuePool().createColorValue(parsedColor.rgb()));
 }
 
 void HTMLElement::defaultEventHandler(Event* event)
 {
     if (event->type() == eventNames().keypressEvent && event->isKeyboardEvent()) {
         handleKeypressEvent(toKeyboardEvent(event));
         if (event->defaultHandled())
             return;
@@ skipping 23 matching lines @@
 #ifndef NDEBUG
 
 // For use in the debugger
 void dumpInnerHTML(WebCore::HTMLElement*);
 
 void dumpInnerHTML(WebCore::HTMLElement* element)
 {
     printf("%s\n", element->innerHTML().ascii().data());
 }
 #endif