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

Source/core/rendering/style/StyleRareInheritedData.cpp

Index: Source/core/rendering/style/StyleRareInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareInheritedData.cpp b/Source/core/rendering/style/StyleRareInheritedData.cpp
index 8db21a068bfb22de531d53a3cec8de8262e3275e..3ca9ff22144720e54b9280cb413c5c2b231009f2 100644
--- a/Source/core/rendering/style/StyleRareInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareInheritedData.cpp
@@ -33,9 +33,9 @@ namespace WebCore {
 
 struct SameSizeAsStyleRareInheritedData : public RefCounted<SameSizeAsStyleRareInheritedData> {
     void* styleImage;
-    StyleColor firstColor;
+    Color firstColor;
     float firstFloat;
-    StyleColor colors[5];
+    Color colors[5];
     void* ownPtrs[1];
     AtomicString atomicStrings[5];
     void* refPtrs[2];
@@ -46,7 +46,7 @@ struct SameSizeAsStyleRareInheritedData : public RefCounted<SameSizeAsStyleRareI
     unsigned unsigneds[1];
     short hyphenationShorts[3];
 
-    StyleColor touchColors;
+    Color touchColors;
 
     void* variableDataRefs[1];
 };