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

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https://hg.mozilla.org/integration/gaia-2_0/rev/c4f6f2bd640d
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #21176 from chirarobert/uplift_icon_count

Bug 1030764 - [Flame] Searching for Facebook returns only two search res...

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https://hg.mozilla.org/integration/gaia-2_0/rev/a8c1da396645
Author: chirarobert <robert.chira@softvision.ro>
Desc: Bug 1030764 - [Flame] Searching for Facebook returns only two search results, even though there should be far more search results available
Bumping manifests a=b2g-bump