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

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https://hg.mozilla.org/integration/gaia-central/rev/f299a464ccbb
Author: Arthur Chen <crh0716@gmail.com>
Desc: Merge pull request #14639 from crh0716/913326

Bug 913326 - Set voice privacy mode at startup r=alive, jaoo

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https://hg.mozilla.org/integration/gaia-central/rev/43f6981acc53
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 913326 - Set voice privacy mode at startup

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "7725ca500b74da11277068eb670575a59d279081", 
+    "revision": "f299a464ccbb8c6d1b66faaeed7232a9339f8766", 
     "repo_path": "/integration/gaia-central"
 }