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

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https://hg.mozilla.org/integration/gaia-2_1/rev/e878cdd206e3
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1102204 - Update search provider rendering r=kgrandon

Conflicts:
	apps/search/js/providers/provider.js
	apps/search/test/marionette/browser_test.js
Bumping manifests a=b2g-bump