Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

========

https://hg.mozilla.org/integration/gaia-central/rev/45da563521df
Author: Arthur Chen <crh0716@gmail.com>
Desc: Bug 928851 - Adopt new API of enabling/disabing RIL radio

========

https://hg.mozilla.org/integration/gaia-central/rev/58f3c3b357d2
Author: Ben Kelly <bkelly@mozilla.com>
Desc: Merge pull request #13488 from wanderview/contacts-fast-remove

Bug 936206: Short-circuit contact remove().  r=jmcf

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https://hg.mozilla.org/integration/gaia-central/rev/ff76872c96f2
Author: Ben Kelly <ben@wanderview.com>
Desc: Bug 936206: Short-circuit contact remove().

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "dc7a50bca58536301c07399243b9350e3dedc896", 
+    "revision": "45da563521dfd7e7883ebce9bae0728d522a4fad", 
     "repo_path": "/integration/gaia-central"
 }