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

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https://hg.mozilla.org/integration/gaia-central/rev/e6a8834fd634
Author: Hubert Figuière <hub@figuiere.net>
Desc: Merge pull request #32312 from hfiguiere/bug1212022-az-picker

Bug 1212022 - Fix A-Z Picker for albums and artists: lowercase id. r=squib

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https://hg.mozilla.org/integration/gaia-central/rev/0c121597c401
Author: Hubert Figuière <hub@figuiere.net>
Desc: Bug 1212022 - Fix A-Z Picker for albums and artists: lowercase id.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "b2054862fe09bb3679399f5dfa68b0d3a9b32c47", 
+        "git_revision": "84d73ac142fadbb715a792a9b3add8ced02094d3", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "3ba95d6596da55993f9ce75524b72b68368c8205", 
+    "revision": "e6a8834fd63429acbadee50231d0ec4422c26cd4", 
     "repo_path": "integration/gaia-central"
 }