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

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https://hg.mozilla.org/integration/gaia-central/rev/686dbd9a1bdc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1076454 - Disable intermittent failing test, TEST-UNEXPECTED-FAIL | /builds/slave/test/gaia/apps/system/test/marionette/browser_chrome_share_web_result_test.js | Browser Chrome - Share Web Result share web result via e-mail r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/b104ffd9d161
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1027707 - Replace the existing module loading facilities in calendar r=millermedeiros"

This reverts commit abf72f5e6259e4c2c5c744b603931f89ef4512c4.
Bumping manifests a=b2g-bump