Bumping gaia.json for 1 gaia revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/90779632fefa
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Revert "Bug 1015295 - [Keyboard] Update to use gaia-header"

This reverts commit 26975d023609464c9c2341b8683e236398981f16.

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "b3e4bc16766fc701b06f06fe874bc270fb4fdfa7", 
+    "revision": "90779632fefaf37388b38da6890d36b352fa2a85", 
     "repo_path": "/integration/gaia-central"
 }