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 2a2560774ca9dc05967d26047ddc43d08db1a0d4..e9df8e06312f1973f1e707643ac4f6d56fba3ce6 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->style()->visitedDependentColor(CSSPropertyBackgroundColor);
+        backgroundColor = o->resolveColor(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