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

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https://hg.mozilla.org/integration/gaia-central/rev/85bebb37650e
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #16375 from julienw/bump-test-agent-0.18.0

Bug 973665 - Bump version to 0.18.0 in Gaia r=me

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https://hg.mozilla.org/integration/gaia-central/rev/c7e27df3a616
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 973665 - Bump version to 0.18.0 in Gaia

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "f0711dcb4c9e9aedfb27333cbc2cdaebe9d3baf6", 
+    "revision": "85bebb37650e8820bc891e23e5b5fd3e64825b37", 
     "repo_path": "/integration/gaia-central"
 }