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

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https://hg.mozilla.org/integration/gaia-central/rev/dfdfefd09d30
Author: Wilson Page <wilsonpage@me.com>
Desc: Merge pull request #18893 from verchaswa/Bug975558_Camera_Madai_Visual_Design_Self_Timer

[Bug975558][Camera][Madai]Visual Design Self-Timer

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https://hg.mozilla.org/integration/gaia-central/rev/f83f09d58d27
Author: verchaswa.sharma <verchaswa.sharma@lge.com>
Desc: [Bug975558][Camera][Madai]Visual Design Self-Timer

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8b6fca77354f80e30eacf6217ad9a5aeaca3912f", 
+    "revision": "dfdfefd09d304229fd2c6de2f4f7df1a8a99153e", 
     "repo_path": "/integration/gaia-central"
 }