Backed out changeset d0966e12e042 (bug 897996)

b2g/app/b2g.js

@@ -109,7 +109,6 @@ pref("mozilla.widget.use-buffer-pixmap", true);
 pref("mozilla.widget.disable-native-theme", true);
 pref("layout.reflow.synthMouseMove", false);
 pref("layers.enable-tiles", true);
-pref("layers.low-precision-buffer", true);
 /*
    Cross Process Mutex is not supported on Mac OS X so progressive
    paint cannot be enabled for B2G on Mac OS X desktop