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

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https://hg.mozilla.org/integration/gaia-central/rev/7d90c3bf2256
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1035930 - Disable test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/clock/test/marionette/alarm_test.js | Alarm System statusbar shows an icon when an alarm is active

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https://hg.mozilla.org/integration/gaia-central/rev/53213b27e448
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1029766 - Intermittent TEST-UNEXPECTED-FAIL | collection_test.js | Vertical - Collection drag icon (/w entry point) into collection
Bumping manifests a=b2g-bump