Bug 907188: Don't show dividers in Bookmarks page if the list is empty. [r=lucasr]

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extra : rebase_source : 6abe73b50f302c0c4ad72408271c4601624a39d4
bug 904893 - Snapped view testing r=sfoster

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extra : rebase_source : 870972071ae6eddf90e35179af8301f27476f5ba
bug 904893 - Splitting head.js into multiple files r=sfoster

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extra : rebase_source : fd5e076a9f7cc17e86e7303f73cdeb61a1810465