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

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https://hg.mozilla.org/integration/gaia-central/rev/eb9aa525ae92
Author: Greg Weng <snowmantw@gmail.com>
Desc: Merge pull request #21786 from snowmantw/issue1023500

Bug 1023500 - [VsD Refresh] Lockscreen Visual Refresh > Notifications no...

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https://hg.mozilla.org/integration/gaia-central/rev/abb127a313e5
Author: Greg Weng <snowmantw@gmail.com>
Desc: Bug 1023500 - [VsD Refresh] Lockscreen Visual Refresh > Notifications not to spec

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https://hg.mozilla.org/integration/gaia-central/rev/11e7643e09fd
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #21745 from crdlc/bug-1038622

Bug 1038622 - [Collection App] Divider is not displayed installing an ap...

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https://hg.mozilla.org/integration/gaia-central/rev/45c89d674f9e
Author: crdlc <crdlc@tid.es>
Desc: Bug 1038622 - [Collection App] Divider is not displayed installing an app without pinned apps while synchronization

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "8cd6c73ef83257a569d148e246108b2c161127bb", 
+    "revision": "eb9aa525ae927c697b4534e83fee8a46842cfad4", 
     "repo_path": "/integration/gaia-central"
 }