Bumping gaia.json for 2 gaia-1_2 revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-1_2/rev/0ca7f3bc7aa8
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #14547 from davidflanagan/bug946519-v1.2

Bug 944276: MMS workaround for problem with memory-backed blobs r=julienw

========

https://hg.mozilla.org/integration/gaia-1_2/rev/6e7885ab9acc
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 944276: MMS workaround for problem with memory-backed blobs

fix failing test and address review comments