Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/beb86a3910aa
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #14532 from julienw/fix-intermittent-call-log

Bug 938207 - [Dialer] Intermittent Travis Unit Test Failure: dialer/call...

========

https://hg.mozilla.org/integration/gaia-central/rev/8e4a3ba31edf
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 938207 - [Dialer] Intermittent Travis Unit Test Failure: dialer/call_log_db Two calls, same group, different hour Add a call: Error: timeout of 2000ms exceeded r=etienne

* increase the timeout for the call_log_db tests because we're using an
  asynchronous IndexedDB API and we really want to use it even in the tests
* rename calllog_db_test to call_log_db_test so that the tests will be run when
  saving call_log_db.js