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

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https://hg.mozilla.org/integration/gaia-central/rev/ae420ed62320
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #14431 from mikehenrty/revert-keyboard

Revert "Merge pull request #14148 from caseyyee/bug-929361"

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https://hg.mozilla.org/integration/gaia-central/rev/36f8d80d9306
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Revert "Merge pull request #14148 from caseyyee/bug-929361"

This reverts commit 215febd4fcfda2f417b17437bf884459340cbf6f, reversing
changes made to 69ce560b82cc65078246d168e0ca4efb09888000.

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https://hg.mozilla.org/integration/gaia-central/rev/43c885109217
Author: Evan Xd <itoyxd@gmail.com>
Desc: Revert "Bug 945611 - Run marionette tests for a specific app."

This reverts commit 88fdb98e896bf5974fc6bc5ab2b5204097cee800.