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

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https://hg.mozilla.org/integration/gaia-central/rev/4e0897d8651b
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc: Merge pull request #13252 from mpizza/Bug_930817_fitText

 Bug 930817 - [B2G][1.2][l10n][Keyboard] Long words in the Auto Correct ... r=rudyl.

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https://hg.mozilla.org/integration/gaia-central/rev/58aa6decd41a
Author: GaryChen(pychen) <mmm198219@gmail.com>
Desc:  Bug 930817 - [B2G][1.2][l10n][Keyboard] Long words in the Auto Correct suggestion bar cut each other off
     -- remove docFragment method to generate candidate ele since use docFragment can get cliendwidth and getBoundingClientRect