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

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https://hg.mozilla.org/integration/gaia-central/rev/a952b64a500c
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #12574 from viorelaioia/bug-922019

Bug 922019 - Fix broken progress locator for video app object

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https://hg.mozilla.org/integration/gaia-central/rev/a70b3f12e61e
Author: Viorela Ioia <viorelaioia@gmail.com>
Desc: Bug 922019 - Fix broken progress locator for video app object

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "6844e79240a41556e64200bfce74ee311439f96b", 
+    "revision": "a952b64a500c751f431a51936276ac9847865752", 
     "repo_path": "/integration/gaia-central"
 }