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

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https://hg.mozilla.org/integration/gaia-central/rev/d3bba6e0bbbd
Author: Justin D'Arcangelo <justindarc@gmail.com>
Desc: Merge pull request #18039 from wilsonpage/991808

Bug 991808 - [camera] remove countdown timer sound

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https://hg.mozilla.org/integration/gaia-central/rev/d5506d7031ec
Author: Wilson Page <wilsonpage@me.com>
Desc: Bug 991808 - [camera] remove countdown timer sound

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "36b38906a4b9b43bc6cedf35e6cbe339fdc84e77", 
+    "revision": "d3bba6e0bbbd897723f7e8f9c4ee7339c3358ba6", 
     "repo_path": "/integration/gaia-central"
 }