delete obsolete SELinux code.

This settings field only shows up on devices which have the
ro.build.selinux property, which is never something we added. This code
is dead.

Change-Id: I20349b4e8fea5be761047e47d4551c1a4f087a37
Test: code compiles and setting app works.

res/values/strings.xml

@@ -2634,8 +2634,6 @@
     <string name="kernel_version">Kernel version</string>
     <!-- About phone screen,  setting option name  [CHAR LIMIT=40] -->
     <string name="build_number">Build number</string>
-    <!-- About phone screen,  setting option name  [CHAR LIMIT=40] -->
-    <string name="selinux_status">SELinux status</string>
 
     <!-- About phone screen, show when a value of some status item is unavailable. -->
     <string name="device_info_not_available">Not available</string>
@@ -5974,11 +5972,6 @@
     from their cell phone carrier. The use of the string is similar to the string
     "system_update_settings_list_item_title" in this project. [CHAR LIMIT=25] -->
     <string name="additional_system_update_settings_list_item_title">Additional system updates</string>
-    <!-- These statuses are displayed when a device was built with SE Android supoprt.
-    These are displayed by the settings app in the about section. -->
-    <string name="selinux_status_disabled">Disabled</string>
-    <string name="selinux_status_permissive">Permissive</string>
-    <string name="selinux_status_enforcing">Enforcing</string>
 
     <!-- Notification of installed CA Certs --> <skip/>
 

res/xml/device_info_settings.xml

@@ -103,10 +103,4 @@
                 android:title="@string/build_number"
                 android:summary="@string/summary_placeholder"/>
 
-        <!-- SELinux status information -->
-        <Preference
-                android:key="selinux_status"
-                android:title="@string/selinux_status"
-                android:summary="@string/selinux_status_enforcing"/>
-
 </PreferenceScreen>

src/com/android/settings/DeviceInfoSettings.java

@@ -35,7 +35,6 @@ import com.android.settings.deviceinfo.FirmwareVersionPreferenceController;
 import com.android.settings.deviceinfo.KernelVersionPreferenceController;
 import com.android.settings.deviceinfo.ManualPreferenceController;
 import com.android.settings.deviceinfo.RegulatoryInfoPreferenceController;
-import com.android.settings.deviceinfo.SELinuxStatusPreferenceController;
 import com.android.settings.deviceinfo.SafetyInfoPreferenceController;
 import com.android.settings.deviceinfo.SecurityPatchPreferenceController;
 import com.android.settings.search.BaseSearchIndexProvider;
@@ -129,7 +128,6 @@ public class DeviceInfoSettings extends DashboardFragment implements Indexable {
         controllers.add(new DeviceModelPreferenceController(context, fragment));
         controllers.add(new SecurityPatchPreferenceController(context));
         controllers.add(new FccEquipmentIdPreferenceController(context));
-        controllers.add(new SELinuxStatusPreferenceController(context));
         controllers.add(new SafetyInfoPreferenceController(context));
         return controllers;
     }

src/com/android/settings/deviceinfo/SELinuxStatusPreferenceController.java

@@ -1,65 +0,0 @@
-/*
- * Copyright (C) 2017 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.android.settings.deviceinfo;
-
-import android.content.Context;
-import android.os.SELinux;
-import android.os.SystemProperties;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceScreen;
-import android.text.TextUtils;
-
-import com.android.settings.R;
-import com.android.settings.core.PreferenceControllerMixin;
-import com.android.settingslib.core.AbstractPreferenceController;
-
-public class SELinuxStatusPreferenceController extends AbstractPreferenceController implements
-        PreferenceControllerMixin {
-
-    private static final String PROPERTY_SELINUX_STATUS = "ro.build.selinux";
-    private static final String KEY_SELINUX_STATUS = "selinux_status";
-
-    public SELinuxStatusPreferenceController(Context context) {
-        super(context);
-    }
-
-    @Override
-    public boolean isAvailable() {
-        return !TextUtils.isEmpty(SystemProperties.get(PROPERTY_SELINUX_STATUS));
-    }
-
-    @Override
-    public String getPreferenceKey() {
-        return KEY_SELINUX_STATUS;
-    }
-
-    @Override
-    public void displayPreference(PreferenceScreen screen) {
-        super.displayPreference(screen);
-        final Preference pref = screen.findPreference(KEY_SELINUX_STATUS);
-        if (pref == null) {
-            return;
-        }
-        if (!SELinux.isSELinuxEnabled()) {
-            String status = mContext.getResources().getString(R.string.selinux_status_disabled);
-            pref.setSummary(status);
-        } else if (!SELinux.isSELinuxEnforced()) {
-            String status = mContext.getResources().getString(R.string.selinux_status_permissive);
-            pref.setSummary(status);
-        }
-    }
-}
-