Bug 1015974 - Prophylactically stop Sync icon animation on creation. r=rnewman

It appears that Android 4.4.2 is a special snow-flake that starts the
animation on creation: http://stackoverflow.com/q/21699985.  This patch
works around that special behaviour.

Don't you love when you need to update your comment -- gleaned from
working code and documentation -- to account for Android inexplicably
changing behaviour?