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

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https://hg.mozilla.org/integration/gaia-central/rev/eb7cd305037c
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #19113 from bebef1987/dis_active_sync

Disable Bug 999447 - Active sync Inbox seems empty in the tests on Jenki...

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https://hg.mozilla.org/integration/gaia-central/rev/8176bd0d5700
Author: Bebe <bebe@mozilla.ro>
Desc: Disable Bug 999447 - Active sync Inbox seems empty in the tests on Jenkins

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https://hg.mozilla.org/integration/gaia-central/rev/6ddb371d0131
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #19071 from chirarobert/keyboard_layout

Bug 1007633 - Keyboard layout re-set in cleanup_gaia is incorrect

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https://hg.mozilla.org/integration/gaia-central/rev/c493b2a92a9d
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 1007633 - Keyboard layout re-set in cleanup_gaia is incorrect
Bumping manifests a=b2g-bump