Show more settings and add restrictions/dialogs for secondary users

Bug: 7213029 crash in About>Status
Bug: 7212495 hide System updates for second user
Bug: 7212230 nickname editor should select the text
Bug: 7160487 TTS settings
Bug: 7129411 Settings needs visibility changes for secondary users

Change-Id: Ia2d1229c08b392edfa6b671fce4a382410405b14

src/com/android/settings/SettingsPreferenceFragment.java

@@ -25,6 +25,7 @@ import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.net.Uri;
 import android.os.Bundle;
+import android.preference.Preference;
 import android.preference.PreferenceActivity;
 import android.preference.PreferenceFragment;
 import android.text.TextUtils;
@@ -66,6 +67,13 @@ public class SettingsPreferenceFragment extends PreferenceFragment implements Di
         }
     }
 
+    protected void removePreference(String key) {
+        Preference pref = findPreference(key);
+        if (pref != null) {
+            getPreferenceScreen().removePreference(pref);
+        }
+    }
+
     /**
      * Override this if you want to show a help item in the menu, by returning the resource id.
      * @return the resource id for the help url