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

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https://hg.mozilla.org/integration/gaia-central/rev/8b5f1810a979
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #17539 from KevinGrandon/bug_967516_enable_device_debug_default

Bug 967516 - Enable DEVICE_DEBUG by default for non production builds r=ochameau

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https://hg.mozilla.org/integration/gaia-central/rev/1213f552a5b5
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 967516 - Enable DEVICE_DEBUG by default for non production builds r=ochameau

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "ad986818e3f1489c62c2fcdbf891b3866f791bd1", 
+    "revision": "8b5f1810a97960eb748d7c1551b6b9ed56e4bef2", 
     "repo_path": "/integration/gaia-central"
 }