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

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https://hg.mozilla.org/integration/gaia-central/rev/a5312343c479
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #16543 from mikehenrty/bug-974211-calllist

Bug 974211 - [B2G] [Dialer] Group call phone numbers are truncated, r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/d03972c8e801
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 974211 - [B2G] [Dialer] Group call phone numbers are truncated

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https://hg.mozilla.org/integration/gaia-central/rev/3af3a4d8960b
Author: bholley <bobbyholley@gmail.com>
Desc: Merge pull request #16725 from bholley/fix_bareword_constructors

 Bug 976937 - Fix usage of Bareword DOM constructors in Gaia. v3 r=zcampbell,kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/a661ed4c065e
Author: Bobby Holley <bobbyholley@gmail.com>
Desc: Bug 976937 - Fix usage of Bareword DOM constructors in Gaia. v3 r=zcampbell,kgrandon
Bumping manifests a=b2g-bump