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

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https://hg.mozilla.org/integration/gaia-central/rev/340ca395d9cb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #17492 from KevinGrandon/debug_intermittent_tests_fix

Bug 986960 - Intermittent erroring test, should flick through images in fullscreen mode

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https://hg.mozilla.org/integration/gaia-central/rev/b8ec955cd564
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 986960 - Intermittent erroring test, should flick through images in fullscreen mode
Bumping manifests a=b2g-bump