Support waiting for reftests that shouldn't have screenshots taken onload
Bug 945222 - Update web-platform-tests expected data to revision a1298604ab08108b141f3f94cdc924d9846cc49c
Set fewer prefs on b2g
Bug 945222 - Update web-platform-tests to revision 230dc8d4c3f81b3007165e6e8279fe7adc8f9778