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

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https://hg.mozilla.org/integration/gaia-central/rev/46003c7d6ba5
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #16726 from gaye/revert-bug-972666

Revert "Merge pull request #16621 from millermedeiros/972666-lines-over-...

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https://hg.mozilla.org/integration/gaia-central/rev/3cd53688bbfc
Author: Gareth Aye <gaye@mozilla.com>
Desc: Revert "Merge pull request #16621 from millermedeiros/972666-lines-over-events"

This reverts commit b1fdd71bf7f3455dbbf015e08175145e02b36d2a, reversing
changes made to 877ddee8e913319780f7e9ccf1770c8af584b976.
Bumping manifests a=b2g-bump