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

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https://hg.mozilla.org/integration/gaia-central/rev/c766bc0d49af
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Merge pull request #18325 from comoyo/bug992346-master

Bug 992346 - Inline keyboard symbols font. r=RudyL

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https://hg.mozilla.org/integration/gaia-central/rev/c789d15b6937
Author: Jan Jongboom <janjongboom@gmail.com>
Desc: Bug 992346 - Inline keyboard symbols font

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "4534848ed341dca245d4684e3c82cd552b57ce08", 
+    "revision": "c766bc0d49af19f18788ad8ed0542b82db81f1d8", 
     "repo_path": "/integration/gaia-central"
 }