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

Source/core/page/Frame.h

Index: Source/core/page/Frame.h
diff --git a/Source/core/page/Frame.h b/Source/core/page/Frame.h
index 8901d62961704835750074c2edb85e731c2b3e6b..894efdc456dc60456fb7ccb3147118328b4b8f88 100644
--- a/Source/core/page/Frame.h
+++ b/Source/core/page/Frame.h
@@ -28,7 +28,6 @@
 #ifndef Frame_h
 #define Frame_h
 
-#include "core/css/StyleColor.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/NavigationScheduler.h"
 #include "core/page/AdjustViewSizeOrNot.h"
@@ -73,7 +72,7 @@ namespace WebCore {
 
         void init();
         void setView(PassRefPtr<FrameView>);
-        void createView(const IntSize&, const StyleColor&, bool,
+        void createView(const IntSize&, const Color&, bool,
             const IntSize& fixedLayoutSize = IntSize(), bool useFixedLayout = false, ScrollbarMode = ScrollbarAuto, bool horizontalLock = false,
             ScrollbarMode = ScrollbarAuto, bool verticalLock = false);