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

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https://hg.mozilla.org/integration/gaia-central/rev/82537f452462
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #17094 from gaye/revert-26cec18074b99c169d1bdf76c8a4a80b0acc4c83

Revert "Bug 970138 - [Tooling] Add a commit hook to unify the file permission

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https://hg.mozilla.org/integration/gaia-central/rev/f73b3caa62e4
Author: Gareth Aye <gaye@mozilla.com>
Desc: Revert "Bug 970138 - [Tooling] Add a commit hook to unify the file permision"

This reverts commit 26cec18074b99c169d1bdf76c8a4a80b0acc4c83.
Bumping manifests a=b2g-bump