Convert location settings to DashboardFragment.

- change LocationMode, LocationSettings, and ScanningSettings to be
DashboardFragment.
- remove LocationSettingsBase and moved base logics into base
controller.
- add controllers for the preferences under the 3 location settings
pages.

Fixes: 68719207
Test: make RunSettingsRoboTests
Change-Id: Icedf691c2a9f7989faebee39ea9da672209b7957

src/com/android/settings/location/AppLocationPermissionPreferenceController.java

@@ -2,8 +2,6 @@ package com.android.settings.location;
 
 import android.content.Context;
 import android.provider.Settings;
-import android.support.v7.preference.Preference;
-import android.support.v7.preference.PreferenceScreen;
 
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settingslib.core.AbstractPreferenceController;
@@ -12,20 +10,11 @@ public class AppLocationPermissionPreferenceController extends
         AbstractPreferenceController implements PreferenceControllerMixin {
 
     private static final String KEY_APP_LEVEL_PERMISSIONS = "app_level_permissions";
-    private Preference mPreference;
 
     public AppLocationPermissionPreferenceController(Context context) {
         super(context);
     }
 
-    @Override
-    public void displayPreference(PreferenceScreen screen) {
-        super.displayPreference(screen);
-        if (isAvailable()) {
-            mPreference = screen.findPreference(KEY_APP_LEVEL_PERMISSIONS);
-        }
-    }
-
     @Override
     public String getPreferenceKey() {
         return KEY_APP_LEVEL_PERMISSIONS;