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

========

https://hg.mozilla.org/integration/gaia-central/rev/64bce0f41677
Author: Yoshi Huang <allstars.chh@mozilla.com>
Desc: Merge pull request #18378 from svic/Bug_959059

Bug 959059: Abort shrinkUI if P2P link is gone. r=alive

========

https://hg.mozilla.org/integration/gaia-central/rev/18f6ab3128c9
Author: Garner Lee <garner.lee@telekom.com>
Desc: Bug 959059: Abort Shrinking UI if P2P link is gone. r=alive

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "9a6c985803729654d45a33909fbeac761855292b", 
+    "revision": "64bce0f41677ce5ac6a01aac8db56208af980a6d", 
     "repo_path": "/integration/gaia-central"
 }