Bug 937829: QuickShare with more icons. [r=mfinkle]

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rename : browser/themes/linux/Toolbar-inverted.png => browser/themes/windows/Toolbar-inverted.png
extra : rebase_source : b3bea92b63ce42d7bec2a2da55075e42453b3e56
Bug 937829: Cleanup the layout glitch when only one share icon is shown. [r=mfinkle]

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extra : rebase_source : c9432f960f8295d27d2756406dd0067d7427d83e
Bug 937829: Make QuickShare aware of the history to choose the icons. [r=mfinkle]

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extra : rebase_source : 9a6d15dc3e4355c9063a4d49cae02259cf3d4cb3