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

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https://hg.mozilla.org/integration/gaia-1_2/rev/fd4cec0905aa
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 943817 - Marionette timeouts are lost when using the --restart command line option. r=zcampbell