bug 894798 - disable word-cache expiration timer on release builds. r=roc a=bajaj
Backed out 11 changesets (bug 920551) for landing on the wrong branch. a=backout

Backed out changeset d70b80fb400d (bug 920551)
Backed out changeset a2c2a0b7626e (bug 920551)
Backed out changeset fdc1b9ae7b8c (bug 920551)
Backed out changeset 7223b4bc24f7 (bug 920551)
Backed out changeset 89e114a84396 (bug 920551)
Backed out changeset c57a2291acaa (bug 920551)
Backed out changeset fcb5a4dfe061 (bug 920551)
Backed out changeset da509068de16 (bug 920551)
Backed out changeset 3424107aeace (bug 920551)
Backed out changeset e3442ce8ca07 (bug 920551)
Backed out changeset 373cd1f52f7f (bug 920551)