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

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https://hg.mozilla.org/integration/gaia-central/rev/7d6f0979c4f3
Author: John Hu <johu@mozilla.com>
Desc: Merge pull request #26758 from huchengtw-moz/bug-1111416-copy-components-from-tv-shared

Bug 1111416 - [Stingray] enable webcomponents support in tv_build, r=chens, rexboy

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https://hg.mozilla.org/integration/gaia-central/rev/040271853bd5
Author: John Hu <johu@mozilla.com>
Desc: Bug 1111416 - [Stingray] enable webcomponents support in tv_build
Bumping manifests a=b2g-bump