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

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https://hg.mozilla.org/integration/gaia-central/rev/c659a8149e13
Author: autolander <bug.autolander@gmail.com>
Desc: Bug 1106666 - merge pull request #26628 from KevinGrandon:bug_1106666_window_transition_fix to mozilla-b2g:master

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https://hg.mozilla.org/integration/gaia-central/rev/fd296d9c733d
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1106666 - Fix browser window transition

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "cfc4dbaac967e015701f217d4cbbd28c8c507ec7", 
+    "revision": "c659a8149e13901dbd7fb8fdf93bb00019aab5fe", 
     "repo_path": "integration/gaia-central"
 }