Move isValid/isCurrentColor from Color to StyleColor

Source/core/rendering/style/StyleInheritedData.h

Index: Source/core/rendering/style/StyleInheritedData.h
diff --git a/Source/core/rendering/style/StyleInheritedData.h b/Source/core/rendering/style/StyleInheritedData.h
index ac7a73f175ed7fb1ff60fac08283d49765bbcbbb..3cb6674de864a7f67c8e9437d7622c7bc4d978d8 100644
--- a/Source/core/rendering/style/StyleInheritedData.h
+++ b/Source/core/rendering/style/StyleInheritedData.h
@@ -25,8 +25,8 @@
 #ifndef StyleInheritedData_h
 #define StyleInheritedData_h
 
+#include "core/css/StyleColor.h"
 #include "core/platform/Length.h"
-#include "core/platform/graphics/Color.h"
 #include "core/platform/graphics/Font.h"
 #include <wtf/PassRefPtr.h>
 #include <wtf/RefCounted.h>
@@ -54,8 +54,8 @@ public:
     Length line_height;
 
     Font font;
-    Color color;
-    Color visitedLinkColor;
+    StyleColor color;
+    StyleColor visitedLinkColor;
 
 private:
     StyleInheritedData();