Lockdown 'remove user' with user restriction in Settings for phones.

Bug: 16367204
Change-Id: I87a30412e89ecb2ae3e7d57edc347cd5b2d1e354
diff --git a/src/com/android/settings/users/UserDetailsSettings.java b/src/com/android/settings/users/UserDetailsSettings.java
index d342fad..bdfff7c 100644
--- a/src/com/android/settings/users/UserDetailsSettings.java
+++ b/src/com/android/settings/users/UserDetailsSettings.java
@@ -95,6 +95,9 @@
             mPhonePref.setChecked(
                     !mDefaultGuestRestrictions.getBoolean(UserManager.DISALLOW_TELEPHONY));
         }
+        if (mUserManager.hasUserRestriction(UserManager.DISALLOW_REMOVE_USER)) {
+            removePreference(KEY_REMOVE_USER);
+        }
         mPhonePref.setOnPreferenceChangeListener(this);
     }