Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0e7d00cd0dbe
Author: Casey Yee <cyee@mozilla.com>
Desc: Merge pull request #14192 from caseyyee/bug-941919

Bug 941919 - [B2G][Video] Back button is difficult to see after selectin...

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https://hg.mozilla.org/integration/gaia-central/rev/8c81297c7b6d
Author: Casey Yee <casey@caseyyee.com>
Desc: Bug 941919 - [B2G][Video] Back button is difficult to see after selecting a video