Move isValid/isCurrentColor from Color to StyleColor

Source/core/rendering/style/StyleRareNonInheritedData.h

Index: Source/core/rendering/style/StyleRareNonInheritedData.h
diff --git a/Source/core/rendering/style/StyleRareNonInheritedData.h b/Source/core/rendering/style/StyleRareNonInheritedData.h
index 6f024ed3190cdd6407ec1ee657349badcb49018f..85c0a8f151271c0f0996360d95ab2fb84fcebb06 100644
--- a/Source/core/rendering/style/StyleRareNonInheritedData.h
+++ b/Source/core/rendering/style/StyleRareNonInheritedData.h
@@ -25,6 +25,7 @@
 #ifndef StyleRareNonInheritedData_h
 #define StyleRareNonInheritedData_h
 
+#include "core/css/StyleColor.h"
 #include "core/rendering/ClipPathOperation.h"
 #include "core/rendering/style/BasicShapes.h"
 #include "core/rendering/style/CounterDirectives.h"
@@ -130,14 +131,14 @@ public:
 
     RefPtr<ClipPathOperation> m_clipPath;
 
-    Color m_textDecorationColor;
-    Color m_visitedLinkTextDecorationColor;
-    Color m_visitedLinkBackgroundColor;
-    Color m_visitedLinkOutlineColor;
-    Color m_visitedLinkBorderLeftColor;
-    Color m_visitedLinkBorderRightColor;
-    Color m_visitedLinkBorderTopColor;
-    Color m_visitedLinkBorderBottomColor;
+    StyleColor m_textDecorationColor;
+    StyleColor m_visitedLinkTextDecorationColor;
+    StyleColor m_visitedLinkBackgroundColor;
+    StyleColor m_visitedLinkOutlineColor;
+    StyleColor m_visitedLinkBorderLeftColor;
+    StyleColor m_visitedLinkBorderRightColor;
+    StyleColor m_visitedLinkBorderTopColor;
+    StyleColor m_visitedLinkBorderBottomColor;
 
     int m_order;