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

========

https://hg.mozilla.org/integration/gaia-central/rev/428cccdc7a3b
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #14305 from crdlc/bug-945628

Bug 945628 - [Download Manager] Discover storage name and relative path ...

========

https://hg.mozilla.org/integration/gaia-central/rev/f1fc57d12fa6
Author: crdlc <crdlc@tid.es>
Desc: Bug 945628 - [Download Manager] Discover storage name and relative path from absolute paths

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "e8c50e6a91ad5aedc7735bab46a5c7a9a0f34c96", 
+    "revision": "428cccdc7a3b4c40f40dda80b6031d26ac9d2d68", 
     "repo_path": "/integration/gaia-central"
 }