Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/6db3d190e478
Author: Tzu-Lin Huang <dwi019@gmail.com>
Desc: Merge pull request #27848 from dwi2/bug1124989

Bug 1124989 - [Stingray][Demo] Use string format and update sample messages

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https://hg.mozilla.org/integration/gaia-central/rev/58fb89c76ef4
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Modify notification message as UX suggested, and we are able to use addEventListner on 'message' now

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https://hg.mozilla.org/integration/gaia-central/rev/f943673d7132
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Use true/false as state value

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https://hg.mozilla.org/integration/gaia-central/rev/424e27edc67e
Author: Tzu-Lin Huang <tzhuang@mozilla.com>
Desc: Bug 1124989 - [Stingray][Demo] Use string format and update sample messages

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "2b83a6d5d1185a438b5bbd287497ac2743b501db", 
+        "git_revision": "18b38bc3dc6f838500b88820c05589438b90e62c", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "7edddf4d690ada18610e05f657880e0e8b7f84df", 
+    "revision": "6db3d190e4783613c54f94efbe4650863ccbf559", 
     "repo_path": "integration/gaia-central"
 }