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

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https://hg.mozilla.org/integration/gaia-central/rev/5f344240ed3f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #18434 from KevinGrandon/bug_990028_home2_icon_deletion_2

Bug 990028 - [Home2] App and Bookmark Icon Deletion

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https://hg.mozilla.org/integration/gaia-central/rev/b34220a6d6a5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 990028 - [Home2] App and Bookmark Icon Deletion r=me
Bumping manifests a=b2g-bump