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

Source/core/rendering/RenderThemeChromiumWin.cpp

Index: Source/core/rendering/RenderThemeChromiumWin.cpp
diff --git a/Source/core/rendering/RenderThemeChromiumWin.cpp b/Source/core/rendering/RenderThemeChromiumWin.cpp
index 78f94e728933344f3d5f887183804f343d4882ae..1abbd9f931a654ac90425e5373fd537711a75768 100644
--- a/Source/core/rendering/RenderThemeChromiumWin.cpp
+++ b/Source/core/rendering/RenderThemeChromiumWin.cpp
@@ -552,7 +552,7 @@ bool RenderThemeChromiumWin::paintTextFieldInternal(RenderObject* o,
     // Fallback to white if the specified color object is invalid.
     Color backgroundColor(Color::white);
     if (o->style()->visitedDependentColor(CSSPropertyBackgroundColor).isValid())
-        backgroundColor = o->resolveColor(CSSPropertyBackgroundColor);
+        backgroundColor = o->style()->visitedDependentColor(CSSPropertyBackgroundColor);
 
     // If we have background-image, don't fill the content area to expose the
     // parent's background. Also, we shouldn't fill the content area if the