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

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https://hg.mozilla.org/integration/gaia-central/rev/75527514ec03
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #19157 from crh0716/1007562

Bug 1007562 - Fix javascript errors, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/c5db0466d142
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 1007562 - Fix javascript errors
Bumping manifests a=b2g-bump