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

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https://hg.mozilla.org/integration/gaia-central/rev/26614c51b294
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18402 from KevinGrandon/bug_990028_home2_edit_mode

Bug 990028 - [Home2] App and Bookmark Icon Deletion r=me

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https://hg.mozilla.org/integration/gaia-central/rev/e31f1f1df36d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 990028 - [Home2] App and Bookmark Icon Deletion r=me
Bumping manifests a=b2g-bump