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

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https://hg.mozilla.org/integration/gaia-central/rev/ac1500422cf1
Author: Min-Zhong "John" Lu <mnjul@users.noreply.github.com>
Desc: Merge pull request #22300 from mnjul/bug_1044744_keyboard_frame_manage_another_script

Bug 1044744 - Move IFrame management in keyboard_manager.js to another script. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/289d014f05ee
Author: John Lu [:mnjul] <jlu@mozilla.com>
Desc: Bug 1044744 - Move IFrame management in keyboard_manager.js to another script
Bumping manifests a=b2g-bump