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

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https://hg.mozilla.org/integration/gaia-central/rev/76f0f6d35f8c
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #12284 from mikehenrty/bug-882186-bluescreen

bug 882186 - adding net_error page

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https://hg.mozilla.org/integration/gaia-central/rev/078bfbb83094
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: bug 882186 - adding net_error page