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

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https://hg.mozilla.org/integration/gaia-central/rev/eb159ab3c68c
Author: Ryan VanderMeulen <ryanvm@gmail.com>
Desc: Merge pull request #26269 from weideng/bug1100192

Bug 1100192 - [Keyboard][Handwriting] Add words prediction feature. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/2e21a6d14e34
Author: wdeng <wdeng@mozilla.com>
Desc: Bug 1100192 - [Keyboard][Handwriting] Add words prediction feature

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "2394109622850131322891814c8b85acb5f32df3", 
+    "revision": "eb159ab3c68cdf3059f2500597da3b3020ebddbc", 
     "repo_path": "integration/gaia-central"
 }