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

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https://hg.mozilla.org/integration/gaia-central/rev/60c6a7c8222d
Author: James Lal <james@lightsofapollo.com>
Desc: Merge pull request #10044 from Joshua-S/bug-816455

Bug 816455 - [PDF Viewer] Missing whitespace in description and spelling error in RE...

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https://hg.mozilla.org/integration/gaia-central/rev/fb3f043736ed
Author: Joshua Smith <joshua-smith@verizon.net>
Desc:  [PDF Viewer] Missing whitespace in description and spelling error in README