Eliminate useless 'isManagedProfile' utils method

This exists in UserManager now

Change-Id: If35326a1fe0de3c7bfde842c5c170899dc5d819b

src/com/android/settings/accounts/AccountSettings.java

@@ -248,7 +248,7 @@ public class AccountSettings extends SettingsPreferenceFragment
         // Load the preferences from an XML resource
         addPreferencesFromResource(R.xml.account_settings);
 
-        if (Utils.isManagedProfile(mUm)) {
+        if (mUm.isManagedProfile()) {
             // This should not happen
             Log.e(TAG, "We should not be showing settings for a managed profile");
             finish();