Revert "[Settings] Convert to getSystemService(Class<T>)"

Revert submission 1645152-getSystemService(Class<T>)

Reason for revert: Fix JUnit test failure
Reverted Changes:
I1b4812044:[Settings] Convert to getSystemService(Class<T>)
I278951c24:[Settings] Support getSystemService(Class<T>)

Change-Id: I864a40f82ba9cb4170900ac0c1d77f781b17341f

src/com/android/settings/wifi/WifiNoInternetDialog.java

@@ -102,7 +102,7 @@ public final class WifiNoInternetDialog extends AlertActivity implements
             }
         };
 
-        mCM = getSystemService(ConnectivityManager.class);
+        mCM = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
         mCM.registerNetworkCallback(request, mNetworkCallback);
 
         final NetworkInfo ni = mCM.getNetworkInfo(mNetwork);