1. main patch - Bug 843497 - Update check says 'up to date' for out of date versions on unsupported OS versions. r=bbondy
2. browser patch - Bug 843497 - Update check says 'up to date' for out of date versions on unsupported OS versions. r=bbondy
3. tests patch - Bug 843497 - Update check says 'up to date' for out of date versions on unsupported OS versions. r=bbondy
Bug 840242 - Use the runtime page size to control arena decommit; r=luke

--HG--
extra : rebase_source : 575a7485a5c6ac51f5c0cadc91616302326ce770