Bug 1013796 - Make TraceGlobal deal with partially created global object. r=bz.

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extra : rebase_source : b487663d8d80c88a389d377b027683255460dd48
Bug 1012723 - Stop preserving Window reflectors in WindowStateHolder. r=bz.

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extra : rebase_source : 9be2ebcd765d5cb2fb8cb0a196c0d00f6752f492