Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7892ce2f18d3
Author: gasolin <gasolin@gmail.com>
Desc: Merge pull request #12997 from gasolin/issue-928306

Bug 928306 - [Flatfish][System] Make system dialogs not fill full screen, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/a703477559f7
Author: gasolin <gasolin@gmail.com>
Desc: Bug 928306 - [Flatfish][System] Make system dialogs not fill full screen

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https://hg.mozilla.org/integration/gaia-central/rev/8ee7a8dfedb6
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #12980 from EverythingMe/928912-clear-searchbar

Bug 928912 - [e.me] Searchbar icon toggles incorrectly between Clear and Search

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https://hg.mozilla.org/integration/gaia-central/rev/a514f08980fa
Author: Amir Nissim <amirn@everything.me>
Desc: Bug 928912 - [e.me] Searchbar icon toggles incorrectly between Clear and Search