bug 893266 - Correct regression from bug 861495 by fixing name of nsIWindowMediator::getOuterWindowWithId; r=myk

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extra : amend_source : 2eeb9fe66d13b1aba1457c5582151283f9c439cf
Bug 891169 - Make BackgroundPageThumbs safer when there are private windows open. r=markh
Bug 870104 - Add telemetry to BackgroundPageThumbs. r=markh,froydnj
Bug 879113 part 1/2, favicon errorhandling-Start screen should handle error cases when missing favicons, thumbnails gracefully.r=mbrubeck
Bug 886496 - When doing lazy tab restoration, set the <browser>s in question to display:none until restored (Part 2) r=bnicholson