Bug 891609 - Set the flag before firing system message. r=echou, a=leo+
Bug 899801 - Don't keep more than five "momentums" values in BrowserElementPanning.js. r=vingtetun, a=leo+
Bug 900080 - Use e.message instead of e in onPacket errors. r=wlach, a=test-only
Merge b2g18 to v1.1hd. a=merge