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

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https://hg.mozilla.org/integration/gaia-central/rev/418829c93f09
Author: Florin Strugariu <bebef_1987@yahoo.com>
Desc: Merge pull request #17385 from AndreiH/bug_985927

Bug 985927 - Button locator changed for test_window_open_inside_iframe.T...

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https://hg.mozilla.org/integration/gaia-central/rev/b36e1e1e4b63
Author: Andrei Hutusoru <andreihutusoru@P5069.(none)>
Desc: Bug 985927 - Button locator changed for test_window_open_inside_iframe.TestWindowOpenInsideIframe
Bumping manifests a=b2g-bump