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

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https://hg.mozilla.org/integration/gaia-central/rev/d2f42e82d86f
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #12391 from crdlc/bug-919951

Bug 919951 - DateTimeFormat is no longer needed after deleting the clock in the landing page

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https://hg.mozilla.org/integration/gaia-central/rev/fabc1e9f8884
Author: crdlc <crdlc@tid.es>
Desc: Bug 919951 - DateTimeFormat is no longer needed after deleting the clock in the landing page

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "493172de7bb2a4447699722e1bb73ec670c2246c", 
+    "revision": "d2f42e82d86febacb0572d67fb844a12a7b80236", 
     "repo_path": "/integration/gaia-central"
 }