Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ea495488fa96
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #24225 from KevinGrandon/bug_1069810_home_screen_auth_fix_with_test

Bug 1069810 - Homescreen application does not handle basic authentication in icon urls

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https://hg.mozilla.org/integration/gaia-central/rev/becefc2eddcc
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1069810 - Add icon auth test r=kgrandon

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https://hg.mozilla.org/integration/gaia-central/rev/cd1ae65c84b8
Author: Andreas Larsson <andreas3.larsson@sonymobile.com>
Desc: Bug 1069810 - Homescreen application does not handle basic authentication in icon urls

Use the url string instead of an anchor element when fetching icons
Bumping manifests a=b2g-bump