Bug 940629 - Root StackShape across getChildPropertyOnDictionary calls, r=bhackett

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extra : rebase_source : 57b54ad4f448107a323cf2810eb0231f5e1a1513
Bug 939472 - Remove buffer from multiview list when neutered, r=billm

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extra : rebase_source : 0f010d15b90486f3b16c540a5eaf9a237d3c563b
Bug 940779 - Restrict the scope of a MessageEventInit so it cannot be live across a GC call, r=bent

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extra : rebase_source : 2db09dc1eaab090b94f210bd2478be8d45c976a2
Bug 940724 - Move XMLHttpRequest off of the stack to silence analysis, r=bent

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extra : rebase_source : 591b96238eddbeb88ef3f1df3728fc5d02b9229a