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

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https://hg.mozilla.org/integration/gaia-central/rev/f216f6f4b028
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #13434 from cctuan/934906

Bug 934906 - [Flatfish] Dock disappears

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https://hg.mozilla.org/integration/gaia-central/rev/3b3fc4049aad
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 934906 - [Flatfish] Dock disappears

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "2ed80723bc38dc05ceb4c3260cc31a0bb9aaa2e5", 
+    "revision": "f216f6f4b0281430577531d4d86f282e6f0c11a9", 
     "repo_path": "/integration/gaia-central"
 }