Bug 920248: Temporarily disable TLS false start, r=keeler, r=wtc

--HG--
extra : rebase_source : 4fc35de2d6e2dc99de11b2a2d0c0f3ebe1de8b97
Bug 919603 followup.  Make sure EventTarget has a [Global] descendant, so it actually works right.  r=peterv pending, because CLOSED TREE
Bug 907905 - Mark 647192-1.html as random-if on Android 2.2 for too many intermittent failures.
Bug 907908 - Mark 776265-1a.html as random-if on Android 2.2 for too many intermittent failures.
DONTBUILD CLOSED TREE
Backed out 5 changesets (bug 905493, bug 920125, bug 919603) for mochitest orange on a CLOSED TREE.

Backed out changeset ccef656b2973 (bug 919603)
Backed out changeset 4b29ce0b2fff (bug 919603)
Backed out changeset b0a051ec55b7 (bug 919603)
Backed out changeset baa9a774aad1 (bug 920125)
Backed out changeset e03276bf4eaa (bug 905493)