Bug 832433: Use Android spinners on tabs UI for phones. [r=mfinkle]

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extra : rebase_source : 614269ba99d278771a293c45252ace306bdaa8d9
Bug 832433: Remove Android Tabs widget in tabs ui. [r=mfinkle] [needs-clobber]

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extra : rebase_source : a64bfad708d610e7c9ad78ed2d21132da45d80f4