Fix bug #15335840 "Safety information" search suggestion shown though

..."Safety information" setting is not available in settings app

- implement a SearchIndexProvider for DeviceInfoSettings and
remove some Preference indexing depending on the device state
and configuration
- remove old non used Preferences
- some code cleaning

Change-Id: I3b2c9dc7cb9f1137b553fed9330aeea4020bd2f8

src/com/android/settings/search/Index.java

@@ -498,7 +498,7 @@ public class Index {
     }
 
     private void addIndexablesForXmlResourceUri(Context packageContext, String packageName,
-                                                Uri uri, String[] projection, int baseRank) {
+            Uri uri, String[] projection, int baseRank) {
 
         final ContentResolver resolver = packageContext.getContentResolver();
         final Cursor cursor = resolver.query(uri, projection, null, null, null);
@@ -545,7 +545,7 @@ public class Index {
     }
 
     private void addIndexablesForRawDataUri(Context packageContext, String packageName,
-                                            Uri uri, String[] projection, int baseRank) {
+            Uri uri, String[] projection, int baseRank) {
 
         final ContentResolver resolver = packageContext.getContentResolver();
         final Cursor cursor = resolver.query(uri, projection, null, null, null);

src/com/android/settings/search/SearchIndexableResources.java

@@ -219,7 +219,7 @@ public final class SearchIndexableResources {
         sResMap.put(DeviceInfoSettings.class.getName(),
                 new SearchIndexableResource(
                         Ranking.getRankForClassName(DeviceInfoSettings.class.getName()),
-                        R.xml.device_info_settings,
+                        NO_DATA_RES_ID,
                         DeviceInfoSettings.class.getName(),
                         R.drawable.ic_settings_about));
     }