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

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https://hg.mozilla.org/integration/gaia-central/rev/c5d116ebe95c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #19416 from zacc/bug_1012713

Bug 1012713 - Gaia ui tests build profile without DESKTOP_SHIMS=1

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https://hg.mozilla.org/integration/gaia-central/rev/ab4c02bcf301
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1012713 - Gaia ui tests build profile without DESKTOP_SHIMS=1
Bumping manifests a=b2g-bump