Bug 881950 - Update the metro test harness to return a retry string when activation fails. r=bbondy
Bug 879658: don't expose localStorage to FrameWorker for non-whitelisted social providers, r=mixedpuppy

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extra : rebase_source : 225b3903057e362e180f8ded7e18bf26a63bacb0
Bug 493051: avoid having addEngine select the engine by default, by adding an optional callback to let callers observe the successful addition of the engine, r=MattN

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extra : rebase_source : 1e67f4fbed4324e2d5b8d132cf07be60b3010cf9
bug 882907: move SDK_LIBRARY to mozbuild (logic) r=gps