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

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https://hg.mozilla.org/integration/gaia-central/rev/d126bb88e41f
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15422 from KevinGrandon/bug_956648_remove_test_timeouts

Bug 956648 - Remove timeouts from tests

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https://hg.mozilla.org/integration/gaia-central/rev/4a9bde95178b
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 956648 - Remove timeouts from tests r=julienw

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "70a08d663711474b358b4ddfe816308ed4fa9f3d", 
+    "revision": "d126bb88e41f584ef568553bb962132ff441aa6d", 
     "repo_path": "/integration/gaia-central"
 }