Delete DynamicindexableContentMonitor & all refs to it

Convert input device search into a search query loader

And remove old logic from DynamicIndexableContentMonitor

Change-Id: If652b1ea7c8add9185bbd025055e14925d3a8eec
Bug: 64310452
Bug: 63831980
Test: robotests

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

@@ -61,6 +61,11 @@ public class SearchFeatureProviderImpl implements SearchFeatureProvider {
                 getSiteMapManager());
     }
 
+    @Override
+    public InputDeviceResultLoader getInputDeviceResultLoader(Context context, String query) {
+        return new InputDeviceResultLoader(context, cleanQuery(query), getSiteMapManager());
+    }
+
     @Override
     public SavedQueryLoader getSavedQueryLoader(Context context) {
         return new SavedQueryLoader(context);