Bug 906080 - Assert main thread in isChromeOrXBL(). r=khuey

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extra : rebase_source : e3cebe6ad88ce7f418501365efdca2cf72dfff83
Bug 904810 - Restore old default behavior on Windows that UP/DOWN go to next/prev line also when there's a selection.  r=ehsan
Bug 903524 - Rename TestJSHolder to IsJSHolder. r=smaug
Bug 863390 - add test for window.content === window._content. r=Ms2ger
Bug 902607 - Removed unused functions in nsXPConnect. r=bholley
Bug 906050 - Support long clicking from braille. r=eeejay r=kats