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

========

https://hg.mozilla.org/integration/gaia-central/rev/912f59e40be2
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #26065 from KevinGrandon/bug_1081731_private_browsing

Bug 1081731 - Simple support for private browsing

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https://hg.mozilla.org/integration/gaia-central/rev/cc38a5f28458
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 1081731 - Add support for private browsing r=etienne

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "232676db98e439a38de5b2eccc8ca33e10d6c007", 
+    "revision": "912f59e40be25efc417690f271c665abe57f3aeb", 
     "repo_path": "integration/gaia-central"
 }