shelf: Allow dragging items from main shelf to overflow shelf.

ash/test/shelf_view_test_api.cc

Index: ash/test/shelf_view_test_api.cc
diff --git a/ash/test/shelf_view_test_api.cc b/ash/test/shelf_view_test_api.cc
index 9bf2d8c7e260696b465a4da5f1da7bbb2acbc25e..9114e135f216f4b652459feddd919fc12d40e90e 100644
--- a/ash/test/shelf_view_test_api.cc
+++ b/ash/test/shelf_view_test_api.cc
@@ -162,8 +162,8 @@ bool ShelfViewTestAPI::IsRippedOffFromShelf() {
   return shelf_view_->dragged_off_shelf_;
 }
 
-bool ShelfViewTestAPI::DraggedItemFromOverflowToShelf() {
-  return shelf_view_->dragged_off_from_overflow_to_shelf_;
+bool ShelfViewTestAPI::DraggedItemToAnotherShelf() {
+  return shelf_view_->dragged_to_another_shelf_;
 }
 
 ShelfButtonPressedMetricTracker*