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

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https://hg.mozilla.org/integration/gaia-central/rev/a26ba3d3d76b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #16972 from KevinGrandon/bug_980627_email_trash_action_default

Bug 980627 - [email] selecting the multiselect has inconsistent behavior for 0 items selected

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https://hg.mozilla.org/integration/gaia-central/rev/c7ff2e07dde4
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 980627 - [email] selecting the multiselect has inconsistent behavior for 0 items selected r=jrburke
Bumping manifests a=b2g-bump