Fix button color on Android to match Ash

Source/core/rendering/RenderThemeChromiumAndroid.h

Index: Source/core/rendering/RenderThemeChromiumAndroid.h
diff --git a/Source/core/rendering/RenderThemeChromiumAndroid.h b/Source/core/rendering/RenderThemeChromiumAndroid.h
index ffd6e2bbbede7786cdc38cc54ff1c0fee44e73f5..981ce39511730f90555fcedca92a8d7fbd80b6ac 100644
--- a/Source/core/rendering/RenderThemeChromiumAndroid.h
+++ b/Source/core/rendering/RenderThemeChromiumAndroid.h
@@ -35,8 +35,6 @@ public:
     static PassRefPtr<RenderTheme> create();
     virtual String extraDefaultStyleSheet() OVERRIDE;
 
-    virtual Color systemColor(CSSValueID) const OVERRIDE;
-
     virtual void adjustInnerSpinButtonStyle(RenderStyle*, Element*) const OVERRIDE;
 
     virtual bool delegatesMenuListRendering() const OVERRIDE { return true; }