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

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https://hg.mozilla.org/integration/gaia-central/rev/f90afc79226e
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24723 from KevinGrandon/bug_1071882_browser_landing_navigation

Bug 1071882 - [SystemBrowser] Landing page should navigate to URL

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https://hg.mozilla.org/integration/gaia-central/rev/62aca0b25e2c
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1071882 - [SystemBrowser] Landing page should navigate to URL r=alive
Bumping manifests a=b2g-bump