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

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https://hg.mozilla.org/integration/gaia-central/rev/c062c70df5cb
Author: Bob Silverberg <bob.silverberg@gmail.com>
Desc: Merge pull request #14022 from zacc/bug_939062

Bug 939062 - Address intermittent failure in test_add_contact_to_favorit...

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https://hg.mozilla.org/integration/gaia-central/rev/a04b6c4d928f
Author: Zac Campbell <zcampbell@mozilla.com>
Desc: Bug 939062 - Address intermittent failure in test_add_contact_to_favorites.py

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "790422218779a3c1d849f878e9640fceee232224", 
+    "revision": "c062c70df5cbd1f4862e781ca3b6a4685a3751c3", 
     "repo_path": "/integration/gaia-central"
 }