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

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https://hg.mozilla.org/integration/gaia-central/rev/2c168dab2546
Author: Rudy Lu <me@rudy.lu>
Desc: Merge pull request #23359 from RudyLu/keyboard/Bug1019472

Bug 1019472 - [Keyboard] [ZhuYin] ZhuYin Keyboard should follow the reco...
r=rudylu.

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https://hg.mozilla.org/integration/gaia-central/rev/773aac4df6bc
Author: dxue <dxue@mozilla.com>
Desc: Bug 1019472 - [Keyboard] [ZhuYin] ZhuYin Keyboard should follow the recommendation

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "198ce093d43e19535d5b682334218e80d6889be7", 
+    "revision": "2c168dab254623bae4b6bfcca7af5c3d3ae53de0", 
     "repo_path": "/integration/gaia-central"
 }