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

Source/core/page/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple 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
@@ skipping 119 matching lines @@
 
     void clear();
 
     bool isTransparent() const;
     void setTransparent(bool isTransparent);
 
     // True if the FrameView is not transparent, and the base background color is opaque.
     bool hasOpaqueBackground() const;
 
     Color baseBackgroundColor() const;
-    void setBaseBackgroundColor(const StyleColor&);
-    void updateBackgroundRecursively(const StyleColor&, bool);
+    void setBaseBackgroundColor(const Color&);
+    void updateBackgroundRecursively(const Color&, bool);
 
     bool shouldUpdateWhileOffscreen() const;
     void setShouldUpdateWhileOffscreen(bool);
     bool shouldUpdate() const;
 
     void adjustViewSize();
 
     virtual IntRect windowClipRect(bool clipToContents = true) const;
     IntRect windowClipRectForFrameOwner(const HTMLFrameOwnerElement*, bool clipToLayerContents) const;
 
@@ skipping 70 matching lines @@
     PaintBehavior paintBehavior() const;
     bool isPainting() const;
     bool hasEverPainted() const { return m_lastPaintTime; }
     void setLastPaintTime(double lastPaintTime) { m_lastPaintTime = lastPaintTime; }
     void setNodeToDraw(Node*);
 
     virtual void paintOverhangAreas(GraphicsContext*, const IntRect& horizontalOverhangArea, const IntRect& verticalOverhangArea, const IntRect& dirtyRect);
     virtual void paintScrollCorner(GraphicsContext*, const IntRect& cornerRect);
     virtual void paintScrollbar(GraphicsContext*, Scrollbar*, const IntRect&) OVERRIDE;
 
-    StyleColor documentBackgroundColor() const;
+    Color documentBackgroundColor() const;
 
     static double currentFrameTimeStamp() { return s_currentFrameTimeStamp; }
 
     void updateLayoutAndStyleIfNeededRecursive();
 
     void incrementVisuallyNonEmptyCharacterCount(unsigned);
     void incrementVisuallyNonEmptyPixelCount(const IntSize&);
     void setIsVisuallyNonEmpty() { m_isVisuallyNonEmpty = true; }
     bool isVisuallyNonEmpty() const { return m_isVisuallyNonEmpty; }
     void enableAutoSizeMode(bool enable, const IntSize& minSize, const IntSize& maxSize);
@@ skipping 333 matching lines @@
     ASSERT(!widget || widget->isFrameView());
     return static_cast<const FrameView*>(widget);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toFrameView(const FrameView*);
 
 } // namespace WebCore
 
 #endif // FrameView_h