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

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https://hg.mozilla.org/integration/gaia-central/rev/d3d4d797d0c5
Author: ochameau <poirot.alex@gmail.com>
Desc: Merge pull request #17533 from jryans/devtools-server-tests

Bug 986223 - Test Dev Tools server toggling r=@ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/3a056e561b21
Author: J. Ryan Stinnett <jryans@gmail.com>
Desc: Bug 986223 - Test Dev Tools server toggling

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "f57ba3848b8d880bef4962ab09d3699a65f7d7a1", 
+    "revision": "d3d4d797d0c51bd584c7765a4b8057638df5a21d", 
     "repo_path": "/integration/gaia-central"
 }