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

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https://hg.mozilla.org/integration/gaia-central/rev/cdbf28c5ea80
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12468 from crdlc/bug-920960

Bug 920960 - Page test fails when it is launched isolated

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https://hg.mozilla.org/integration/gaia-central/rev/7e78f0cbff2f
Author: crdlc <crdlc@tid.es>
Desc: Bug 920960 - Page test fails when it is launched isolated

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6b82ab58ac7e7cbce89a6718659311a1ce6b7436", 
+    "revision": "cdbf28c5ea80d7344be1f61355e0e3f4e1dac1d7", 
     "repo_path": "/integration/gaia-central"
 }