Backed out 7 changesets (bug 902525) for B2G reftest failures.

Backed out changeset bbca63772c83 (bug 902525)
Backed out changeset edb386989dbd (bug 902525)
Backed out changeset 3137dadb4fcd (bug 902525)
Backed out changeset e562afcb3c89 (bug 902525)
Backed out changeset 8ef3a516bd68 (bug 902525)
Backed out changeset 520fcd422150 (bug 902525)
Backed out changeset 4e553e8da44e (bug 902525)