Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_0/rev/4a0a9b0ff119
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #21706 from etiennesegonzac/bug-1029979

Bug 1029979 - TonePlayer: prevent successive trash/ensureAudio() calls from creating an AudioContext with a null channel r=gsvelto

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https://hg.mozilla.org/integration/gaia-2_0/rev/cc3a1395b4b3
Author: crdlc <crdlc@tid.es>
Desc: Bug 1037338 - Installed apps arent added to smart collection

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https://hg.mozilla.org/integration/gaia-2_0/rev/c82746c7358c
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #21708 from guilherme-pg/bug1035321-v2.0

Bug 1035321 - Send the accuracy of locations to Find My Device's server.

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https://hg.mozilla.org/integration/gaia-2_0/rev/8a231c2aa176
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 1035321 - Send the accuracy of locations to Find My Device's server.

This also imports mock_l10n.js from bug 1004973, since the tests introduced
in this patch depend on that file.
Bumping manifests a=b2g-bump