Add @media(-moz-windows-accent-color-applies)

#31 point 3

widget/LookAndFeel.h

@@ -238,6 +238,15 @@ public:
     // Should menu items blink when they're chosen?
     eIntID_ChosenMenuItemsShouldBlink,
 
+    /*
+     * A Boolean value to determine whether the Windows accent color
+     * should be applied to the title bar.
+     *
+     * The value of this metric is not used on other platforms. These platforms
+     * should return NS_ERROR_NOT_IMPLEMENTED when queried for this metric.
+     */
+    eIntID_WindowsAccentColorApplies,
+
     /*
      * A Boolean value to determine whether the Windows default theme is
      * being used.