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

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https://hg.mozilla.org/integration/gaia-central/rev/b6f6084a1202
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18082 from willyaranda/bug/993422

Bug 993422. Use a specific string for ActiveSync username

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https://hg.mozilla.org/integration/gaia-central/rev/5291eaf5c332
Author: Guillermo López <gll@tid.es>
Desc: Bug 993422. Use a specific string for ActiveSync username

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https://hg.mozilla.org/integration/gaia-central/rev/7a11c7123ed3
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18300 from guilherme-pg/bug983363

Bug 983363 - Remove debug IAC rule from Find My Device

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https://hg.mozilla.org/integration/gaia-central/rev/aa706b987776
Author: Guilherme Goncalves <guilherme.p.gonc@gmail.com>
Desc: Bug 983363 - Remove debug IAC rules from Find My Device

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "66dd68f62250283bd1f0e8735be659116c48d5b3", 
+    "revision": "b6f6084a1202e94e055da4c3d3e3b8b8127ed82d", 
     "repo_path": "/integration/gaia-central"
 }