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

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https://hg.mozilla.org/integration/gaia-central/rev/c72712522ca1
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #16159 from gasolin/issue-970807

Bug 970807 - [system] jsdoc generation fail with title.js, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/047cc36f1f96
Author: gasolin <gasolin@gmail.com>
Desc: Bug 970807 - [system] jsdoc generation fail with title.js
Bumping manifests a=b2g-bump