Bug 985184 - package WebappsUpdaterTimer.js with Fennec; r=mfinkle

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extra : rebase_source : e9531a6c13298f3f542560d7d7357950ceffcd2e
Bug 985195 - give WebappsUpdateTimer a unique ID; r=mfinkle

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extra : rebase_source : bf637c950996bfeab1f566ac482a4a27560ccb16