Bug 861269 - GC: Continuing the rooting of XPConnect - Convert id_ to idArg style arguments r=bholley

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extra : rebase_source : a0a88749928f3f622b5626adfc8aa23382d06611
Bug 861269 - GC: Continuing the rooting of XPConnect - Root nsXPConnect.cpp r=bholley

--HG--
extra : rebase_source : 4bbe3cc3891cb4b3f820454f0f73acea99b36378
Bug 861269 - GC: Continuing the rooting of XPConnect - Root XPCJSID.cpp r=bholley

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extra : rebase_source : 3702d37309dd711a6db9173d0c6ab6142ce78544
Bug 861800 - Make UnwinderThread2 a bit less verbose.  r=bgirard