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

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https://hg.mozilla.org/integration/gaia-central/rev/8414ec0d1db0
Author: GaryChen, PYChen, Gary <mmm198219@gmail.com>
Desc: Merge pull request #22828 from mpizza/Bug_1050545_remove_focus_while_switch_mode

Bug 1050545 - [Camera] switching to video mode often sets focus in the lower right. r=wilsonpage.

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https://hg.mozilla.org/integration/gaia-central/rev/810c31ff8387
Author: mpizza <mmm198219@gmail.com>
Desc: Bug 1050545 - [Camera] switching to video mode often sets focus in the lower right

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https://hg.mozilla.org/integration/gaia-central/rev/9cba7873c16d
Author: Fernando Campo <fernando.campo@telefonica.com>
Desc: Revert "Merge pull request #22802 from yor-mozilla-com/gaia-header-ftu"

This reverts commit aed03f0656908d25770fe7bc6330fa5a1e9a5353, reversing
changes made to ef5051bbe7a7c30666b058cbcbae42fe9f544c47.
Bumping manifests a=b2g-bump