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

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https://hg.mozilla.org/integration/gaia-central/rev/da86963b7c39
Author: James Burke <jrburke@gmail.com>
Desc: Merge pull request #17561 from jrburke/bug985598-email-double-activity-blank

Bug 985598 - [email] Double-triggering of share/new activity by clicking... r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/3b12bc91f786
Author: jrburke <jrburke@gmail.com>
Desc: Bug 985598 - [email] Double-triggering of share/new activity by clicking on a mailto link results in black screen
Bumping manifests a=b2g-bump