Move more classes to more specific locations.

Moved .model classes to .base.
Deleted some unused classes.
Moved functional tests into a new .funcitonal package.
Followup to 1450250.

Change-Id: Ic087fe4a014d9179fab3dc6f833aaf73373f9452
diff --git a/src/com/android/documentsui/SearchViewManager.java b/src/com/android/documentsui/SearchViewManager.java
index 63c07dd..1bbc439 100644
--- a/src/com/android/documentsui/SearchViewManager.java
+++ b/src/com/android/documentsui/SearchViewManager.java
@@ -32,7 +32,7 @@
 import android.widget.SearchView;
 import android.widget.SearchView.OnQueryTextListener;
 
-import com.android.documentsui.model.RootInfo;
+import com.android.documentsui.base.RootInfo;
 import com.android.documentsui.sorting.SortModel;
 
 /**