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

Source/core/css/resolver/FilterOperationResolver.cpp

Index: Source/core/css/resolver/FilterOperationResolver.cpp
diff --git a/Source/core/css/resolver/FilterOperationResolver.cpp b/Source/core/css/resolver/FilterOperationResolver.cpp
index 14f56ee483e1e16572272535e91964afcab4ee89..34f123a28e3e19d8a4c8ffc402724c5176e5ede1 100644
--- a/Source/core/css/resolver/FilterOperationResolver.cpp
+++ b/Source/core/css/resolver/FilterOperationResolver.cpp
@@ -487,11 +487,11 @@ bool FilterOperationResolver::createFilterOperations(CSSValue* inValue, const Re
             ShadowValue* item = static_cast<ShadowValue*>(cssValue);
             IntPoint location(item->x->computeLength<int>(style, rootStyle, zoomFactor), item->y->computeLength<int>(style, rootStyle, zoomFactor));
             int blur = item->blur ? item->blur->computeLength<int>(style, rootStyle, zoomFactor) : 0;
-            StyleColor shadowColor;
+            Color color;

[leviw_travelin_and_unemployed, 2013/09/04 00:37:11]

Can we keep the updated name for clarity?

[eae, 2013/09/04 00:42:14]

Good idea. Done.

             if (item->color)
-                shadowColor = state.document().textLinkColors().colorFromPrimitiveValue(item->color.get());
+                color = state.document().textLinkColors().colorFromPrimitiveValue(item->color.get(), state.style()->visitedDependentColor(CSSPropertyColor));
 
-            operations.operations().append(DropShadowFilterOperation::create(location, blur, shadowColor.isValid() ? shadowColor.color() : Color::transparent, operationType));
+            operations.operations().append(DropShadowFilterOperation::create(location, blur, color.isValid() ? color : Color::transparent, operationType));
             break;
         }
         case CSSFilterValue::UnknownFilterOperation: