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

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https://hg.mozilla.org/integration/gaia-1_4/rev/ecc1054cade9
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #17329 from 6a68/bug-985476-remove-fxa-strings

Bug 985476 Back out Firefox Accounts strings from 1.4

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https://hg.mozilla.org/integration/gaia-1_4/rev/27be77d97934
Author: Jared Hirsch <ohai@6a68.net>
Desc: Bug 985476 Back out Firefox Accounts strings from 1.4
Bumping manifests a=b2g-bump