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

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https://hg.mozilla.org/integration/gaia-central/rev/4d227fe7d15d
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #26817 from RudyLu/keyboard/Bug1112020-copy_ime_folders

Bug 1112020 - The build script of keyboard app would fail when copying the a
r=timdream.

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https://hg.mozilla.org/integration/gaia-central/rev/eca4f73b9508
Author: Rudy Lu <me@rudy.lu>
Desc: Bug 1112020 - The build script of keyboard app would fail when copying
the a specific ime folder for the 3rd time.
 - Stop copying the same ime folder when it already exists.

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https://hg.mozilla.org/integration/gaia-central/rev/ff22cf4a7ad3
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #26772 from cctuan/1067728

Bug 1067728 - [Text Selection] Hide utility bubble after scrolling if the selected text is out of visible area

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https://hg.mozilla.org/integration/gaia-central/rev/236c1eb69827
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 1067728 - [Text Selection] Hide utility bubble after scrolling if the selected text is out of visible area
Bumping manifests a=b2g-bump