AI 144591: Fix ClassCastException in RadioInfo settings screen.
  BUG=1761604

Automated import of CL 144591
diff --git a/src/com/android/settings/RadioInfo.java b/src/com/android/settings/RadioInfo.java
index b624c7a..521c3c8 100644
--- a/src/com/android/settings/RadioInfo.java
+++ b/src/com/android/settings/RadioInfo.java
@@ -619,8 +619,7 @@
     }
 
     private void updateDnsCheckState() {
-        GSMPhone gsmPhone = (GSMPhone) phone;
-        dnsCheckState.setText(gsmPhone.isDnsCheckDisabled() ?
+        dnsCheckState.setText(phone.isDnsCheckDisabled() ?
                 "0.0.0.0 allowed" :"0.0.0.0 not allowed");
     }