Backed out 9 changesets (bug 1500948, bug 1500949, bug 1448426, bug 1487249, bug 1500950, bug 1500944) for causing talos crashes on  ts_paint | application crashed [@ MOZ_CrashOOL(char const*, int, char const*)]

Backed out changeset 429776feea6b (bug 1500950)
Backed out changeset a300e9ae7a01 (bug 1500949)
Backed out changeset fed1a518579a (bug 1500948)
Backed out changeset a71376319ad7 (bug 1500944)
Backed out changeset 9c5c35cb10aa (bug 1500944)
Backed out changeset b6c97b4db60a (bug 1448426)
Backed out changeset 160a1dbe0be5 (bug 1487249)
Backed out changeset 8caf55928df2 (bug 1487249)
Backed out changeset 176131b18cb4 (bug 1487249)