Bug 1082839 - WebIDL for WindowRoot, r=peterv

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extra : rebase_source : 035e2752e12f31b78accae45eb1534c4dc31b690
Bug 1084421 - Only Events with a wrapper should trigger GC more likely, r=mccr8

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extra : rebase_source : 398e18dfc3d103ee139cc3c5d49710855c925e82