Bug 843907 - Move MapObject and SetObject's key to manual post-barriers; r=jorendorff

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extra : rebase_source : ae9d62120c1a0f212c266bbf3879010cd48e3124
bug 856772 fix japanese/chinese/etc text in social manifests. r=gavin
Bug 784739 - Switch from NULL to nullptr in editor/; r=ehsan