Bug 1187463. Enable containerful scrolling on b2g. r=kats

modules/libpref/init/all.js

@@ -597,8 +597,8 @@ pref("apz.test.logging_enabled", false);
 pref("gfx.hidpi.enabled", 2);
 #endif
 
-#if !defined(MOZ_WIDGET_ANDROID)
+#if !defined(MOZ_WIDGET_GONK) && !defined(MOZ_WIDGET_ANDROID)
-// Containerless scrolling for root frames does not yet pass tests on Android.
+// Use containerless scrolling for now on desktop.
 pref("layout.scroll.root-frame-containers", false);
 #endif