Backed out 2 changesets (bug 794282) because of mochitest-1 timeouts on Linux

Backed out changeset aad877111804 (bug 794282)
Backed out changeset a73bc11da471 (bug 794282)
Backed out changeset 9173dcf026ee (bug 882567) because of mochitest-1 timeouts on Linux

Landed on a CLOSED TREE