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

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https://hg.mozilla.org/integration/gaia-central/rev/d5f77c2bdc18
Author: Mihai Cîrlănaru <mihai@cirlanaru.com>
Desc: Merge pull request #10148 from mcirlanaru/bug_878421

Bug 878421 - [FTE] Properly set language keyboard when flashing device, r=@RudyLu

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https://hg.mozilla.org/integration/gaia-central/rev/aa589e95af44
Author: Mihai Cirlanaru <mihai@cirlanaru.com>
Desc: Bug 878421 - [FTE] Properly set language keyboard when flashing device. r=rudyl

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "efdee3071120ab7a1de9e698eecc5582fdcbcd78", 
+    "revision": "d5f77c2bdc18975098c0478142ca52a492ad3861", 
     "repo_path": "/integration/gaia-central"
 }