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

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https://hg.mozilla.org/integration/gaia-central/rev/637037f23216
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Merge pull request #14381 from davidflanagan/bug927286

Bug 927286: Change keyboard word suggestions so we never display the use...

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https://hg.mozilla.org/integration/gaia-central/rev/9c54a1f2a74b
Author: David Flanagan <dflanagan@mozilla.com>
Desc: Bug 927286: Change keyboard word suggestions so we never display the user's actual input and instead have an X icon to dismiss the suggestions and prevent autocorrection

address review comments

update tests to match new word suggestions behavior

fix merge conflict with bug 929361