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

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https://hg.mozilla.org/integration/gaia-central/rev/9ee041e12d23
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #17494 from gasolin/sheriff971554

Bug 971554 - [System2] Instantiable SoundManager, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/6d1a5c320b69
Author: John Hu <johu@mozilla.com>
Desc: Bug 971554 - [System2] Instantiable SoundManager

Conflicts:
	apps/system/js/bootstrap.js

Conflicts:
	apps/system/test/unit/bootstrap_test.js
	build/jshint/xfail.list
Bumping manifests a=b2g-bump