In prevision of Promise.jsm removal, use defer helper module instead of Promise.jsm
as that's the only one feature that DOM Promise don't support.
PART2: Substitutes promise.defer usages with defer
$ sed -i 's/promise.defer/defer/gI' $(egrep -lir "promise.defer\(\)" devtools)
Reset modification to the following files as they are using deprecated syncable promises as we don't want to touch them.
http://searchfox.org/mozilla-central/search?q=deprecated-sync-thenables&case=true®exp=false&path=
$ git checkout devtools/client/debugger/test/mochitest/
$ git checkout devtools/shared/client/main.js
$ git checkout devtools/client/debugger/
$ git checkout devtools/server/main.js
MozReview-Commit-ID: DGN5ae68wtn
--HG--
extra : rebase_source : 57602d89b0bcc1c905bee7723e30f87fa434c6d9
