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

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https://hg.mozilla.org/integration/gaia-central/rev/8f7de3b4b2a0
Author: Gareth Aye <gaye@mozilla.com>
Desc: Merge pull request #27171 from gaye/bug-1115321

Bug 1113891 - Event remains on the notification screen after tapping on it r=millermedeiros

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https://hg.mozilla.org/integration/gaia-central/rev/136b0f013698
Author: gaye <gaye@mozilla.com>
Desc: Bug 1113891 - Event remains on the notification screen after tapping on it

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https://hg.mozilla.org/integration/gaia-central/rev/8b6028038f80
Author: Rohan Rawat <rohan1395@yahoo.com>
Desc: Bug 1115321 - Remove calendar event notification after user taps on it

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "263599feb1cb41b56b696d3b4fd165c460bf1263", 
+    "revision": "8f7de3b4b2a02f7420c59abbc0ff3a3999005912", 
     "repo_path": "integration/gaia-central"
 }