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

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https://hg.mozilla.org/integration/gaia-central/rev/911e39880486
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Merge pull request #24645 from dominickuo/bug-1043712-new

Bug 1043712 - [Music] listen to touchend instead of click events, r=shamenchens

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https://hg.mozilla.org/integration/gaia-central/rev/9c648de523b0
Author: Dominic Kuo <dkuo@mozilla.com>
Desc: Bug 1043712 - [Music] listen to touchend instead of click events

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "63eccd6a2828d1bbc57fbb6c0530a6f18a350e71", 
+    "revision": "911e39880486dd0139fbd9423c431cea33172f1d", 
     "repo_path": "/integration/gaia-central"
 }