No Bug - Assert that our Rooting ABI is correct; r=sfink

--HG--
extra : rebase_source : 3247d6a22f73d278ae4e6904dff28a1b727e5169
No Bug - Fix an out-of-date comment in Ion about JM compilation; r=bhackett

--HG--
extra : rebase_source : 62d580d82808312c12444cb2c9163b1b569bd945
Bug 829817 - Cycle collect nsCSSPageRule. r=dbaron