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

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https://hg.mozilla.org/integration/gaia-central/rev/8911c19f1f8d
Author: punamdahiya <punamdahiya@yahoo.com>
Desc: Merge pull request #16675 from punamdahiya/Bug970275

Bug970275-[Download Manager]- Fix to display filename in header on opening an image file r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/2b82bdcf1d88
Author: Punam Dahiya <punamdahiya@yahoo.com>
Desc: Bug970275-[Download Manager]- Fix to display filename in header on opening an image file r=crdlc

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https://hg.mozilla.org/integration/gaia-central/rev/f03cae8ab14f
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Merge pull request #16674 from reubenmorais/pt-br-layout

Bug 976791 - Make the pt-BR symbols layout match the en-US layout, but keep R$ instead of $. r=djf

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https://hg.mozilla.org/integration/gaia-central/rev/50e2953055bd
Author: Reuben Morais <reuben.morais@gmail.com>
Desc: Bug 976791 - Make the pt-BR symbol layout match the en-US layout, but keep R$ instead of $. r=djf
Bumping manifests a=b2g-bump
Merge inbound to m-c
Merge  b2g-inbound to m-c
Merge m-c to inbound