Bug 1098667 - Part 1: Import from android-sync. r=rnewman

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extra : rebase_source : afa367b0bb0002a6cfda4a1531bc7c47a5f0effa
extra : source : 705b1be87804d5e3427eb433f6445ef055857a89
Bug 1098667 - Part 2: Add "Finish migrating" view to Remote Tabs home panel. r=rnewman

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extra : rebase_source : f917eda2af5601c154fbd406db9c4d2b83899001
Bug 1080242 - Surface 'Account locked' status. r=rnewman

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extra : rebase_source : 56a7d340960673d6244ae796755935d89885e986