Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/994a52f8d445
Author: Jim Porter <jporter@mozilla.com>
Desc: Bug 1027995 - [followup] Fix localization

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https://hg.mozilla.org/integration/gaia-central/rev/2fee106e8477
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1027995 - [followup] Fix localization"

This reverts commit 29276a94e10041717988ee1e6b20bb16b19bfc48.

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https://hg.mozilla.org/integration/gaia-central/rev/f139d0500ac2
Author: Dale Harvey <dale@arandomurl.com>
Desc: Bug 1054466 - Restore overflow menu via contextmenu. r=kgrandon
Bumping manifests a=b2g-bump