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

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https://hg.mozilla.org/integration/gaia-central/rev/84a77b075bb1
Author: Fernando Campo <fcampo@users.noreply.github.com>
Desc: Merge pull request #20392 from fcampo/import-bt-err-tap-1022115

Bug 1022115 - [Contacts] Can't see detail of contact when multi import via Bluetooth (r=francisco)

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https://hg.mozilla.org/integration/gaia-central/rev/b1bdeaa4ab05
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Bug 1022115 - [Contacts] Cannot tap and see detail of contact when importing multiple via Bluetooth

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https://hg.mozilla.org/integration/gaia-central/rev/3bd2e9998f84
Author: Dave Hunt <dave.hunt@gmail.com>
Desc: Bug 1027621 - Use local content where possible in the browser tests. r=zcampbell
Bumping manifests a=b2g-bump