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

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https://hg.mozilla.org/integration/gaia-central/rev/a66aa7a93fba
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14228 from pivanov/bug-942997

Bug 942997 - [Clock] Update to Dark 1.3 Header

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https://hg.mozilla.org/integration/gaia-central/rev/05f32f79fd41
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 942997 - [Clock] Update to Dark 1.3 Header

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0c30fbda0bf9c105d94ec0726097c9d0ed816ba7", 
+    "revision": "a66aa7a93fba086e8acaae0358e6a46daaf7bdb5", 
     "repo_path": "/integration/gaia-central"
 }