Move isValid/isCurrentColor from Color to StyleColor

Source/core/css/resolver/ElementStyleResources.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 20 matching lines @@
 #include "core/rendering/style/StylePendingImage.h"
 
 namespace WebCore {
 
 ElementStyleResources::ElementStyleResources()
     : m_hasPendingShaders(false)
     , m_deviceScaleFactor(1)
 {
 }
 
-PassRefPtr<StyleImage> ElementStyleResources::styleImage(const TextLinkColors& textLinkColors, Color currentColor, CSSPropertyID property, CSSValue* value)
+PassRefPtr<StyleImage> ElementStyleResources::styleImage(const TextLinkColors& textLinkColors, CSSPropertyID property, CSSValue* value)
 {
     if (value->isImageValue())
         return cachedOrPendingFromValue(property, toCSSImageValue(value));
 
     if (value->isImageGeneratorValue()) {
         if (value->isGradientValue())
-            return generatedOrPendingFromValue(property, static_cast<CSSGradientValue*>(value)->gradientWithStylesResolved(textLinkColors, currentColor).get());
+            return generatedOrPendingFromValue(property, static_cast<CSSGradientValue*>(value)->gradientWithStylesResolved(textLinkColors).get());
         return generatedOrPendingFromValue(property, static_cast<CSSImageGeneratorValue*>(value));
     }
 
     if (value->isImageSetValue())
         return setOrPendingFromValue(property, static_cast<CSSImageSetValue*>(value));
 
     if (value->isCursorImageValue())
         return cursorOrPendingFromValue(property, static_cast<CSSCursorImageValue*>(value));
 
     return 0;
@@ skipping 39 matching lines @@
 
 void ElementStyleResources::clear()
 {
     m_pendingImageProperties.clear();
     m_pendingSVGDocuments.clear();
     m_hasPendingShaders = false;
     m_deviceScaleFactor = 1;
 }
 
 }