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

========

https://hg.mozilla.org/integration/gaia-1_2/rev/73d54ad6cc0a
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14096 from bobsilverberg/008e34cb8d3b40

Bug 935052 - Remove remainder of spurious launch() methods in the middle of tests

========

https://hg.mozilla.org/integration/gaia-1_2/rev/25459bb8e6b5
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 935052 - Remove remainder of spurious launch() methods in the middle of tests