Bug 617860: Disable GPU rendering for fennec-on-windows. r=mfinkle a=b

Bug 617860: Disable GPU rendering for fennec-on-windows. r=mfinkle

mobile/app/mobile.js

@@ -510,6 +510,6 @@ pref("services.sync.autoconnectDelay", 5);
 // threshold where a tap becomes a drag, in 1/240" reference pixels
 pref("ui.dragThreshold", 24);
 
-pref("layers.accelerate-all", false);
+pref("layers.acceleration.disabled", true);
 
 pref("notification.feature.enabled", true);