Bumping gaia.json for 1 gaia-1_3 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_3/rev/3b515de947af
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14957 from crh0716/909266

Bug 909266 - Add settings helper for roaming perference r=alive, jaoo(cherry picked from commit 3b603d6adb6b92df347f953e22e4c5f35927c97d)

Conflicts:
	apps/settings/index.html