Bumping gaia.json for 3 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/9fde3e6f1a18
Author: Zac <zcampbell@mozilla.com>
Desc: Revert "Bug 1067307 - Disable test_eme_add_collection: crash when tapping on a collection a=test-only"

This reverts commit 8ed821f81237e52e7eb91bce55f2290a544bf29a.

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https://hg.mozilla.org/integration/gaia-central/rev/90a3392ca23a
Author: Zac <zcampbell@mozilla.com>
Desc: Merge pull request #24175 from zacc/bug_1068670

Bug 1068670 - Update the gaiatest treeherder mixin to be able to push to...

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https://hg.mozilla.org/integration/gaia-central/rev/cbb62af84ee2
Author: Zac <zcampbell@mozilla.com>
Desc: Bug 1068670 - Update the gaiatest treeherder mixin to be able to push to Flame-KK on treeherder

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8e37e691df5e407e24334a9fadf071ba99b7ae52", 
+    "revision": "9fde3e6f1a18b48aea29b90671ca140920d407da", 
     "repo_path": "/integration/gaia-central"
 }