Bug 877924 - Always trace IDBFactory owner pointer r=mccr8

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extra : rebase_source : 626301faca90a21a03a9f983f7afe88dbdd9e6e7
Bug 650161 - Update plugin tracing to work with compacting GC r=terrence r=johns

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extra : rebase_source : d6852def71710f71121735f24fc176141e911583