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

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https://hg.mozilla.org/integration/gaia-central/rev/a7ba96d51e0a
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1069617 - merge pull request #28155 from eeejay:bug-1069617 to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/b64665e498a2
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1069617 - Put text inside anchor tags in music list view, and assign aria roles.

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "74fddc5eb0cc8c4c937740c9d25ff78dce47b3e5", 
+        "git_revision": "9d47aa9ce7a23682839c196d12abdff5c3ee81c6", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "097a05b77a649346be0d6e0c23b3eaa6d538a648", 
+    "revision": "a7ba96d51e0aeb7ee339f08fc8b945f00bb22da4", 
     "repo_path": "integration/gaia-central"
 }