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

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "a4bb4b7a207f12d16ca697ac93946fd11977634c", 
+    "revision": "4e0897d8651b9833b80793246df03ec885fb463d", 
     "repo_path": "/integration/gaia-central"
 }