Merge similar BaseSearchIndexProvider code together

Bug: 135053028
Test: robolectric, check search_index.db contains the same items
Change-Id: If3c18a170b0e671690df1fdf26e59a421d2c48cd

src/com/android/settings/display/AdaptiveSleepSettings.java

@@ -78,13 +78,5 @@ public class AdaptiveSleepSettings extends DashboardFragment {
     }
 
     public static final SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
-            new BaseSearchIndexProvider() {
-                @Override
-                public List<SearchIndexableResource> getXmlResourcesToIndex(
-                        Context context, boolean enabled) {
-                    final SearchIndexableResource sir = new SearchIndexableResource(context);
-                    sir.xmlResId = R.xml.adaptive_sleep_detail;
-                    return Arrays.asList(sir);
-                }
-            };
+            new BaseSearchIndexProvider(R.xml.adaptive_sleep_detail);
 }