Remove ShelfItemDelegate::IsDraggable; check for app list button.

ash/test/shelf_view_test_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/test/shelf_view_test_api.h"
 
 #include "ash/common/shelf/overflow_button.h"
 #include "ash/common/shelf/shelf_button.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/shelf_model.h"
@@ skipping 32 matching lines @@
 
 ShelfViewTestAPI::~ShelfViewTestAPI() {}
 
 int ShelfViewTestAPI::GetButtonCount() {
   return shelf_view_->view_model_->view_size();
 }
 
 ShelfButton* ShelfViewTestAPI::GetButton(int index) {
   // App list button is not a ShelfButton.
   if (shelf_view_->model_->items()[index].type == ash::TYPE_APP_LIST)
-    return NULL;
+    return nullptr;
 
-  return static_cast<ShelfButton*>(shelf_view_->view_model_->view_at(index));
+  return static_cast<ShelfButton*>(GetViewAt(index));
+}
+
+views::View* ShelfViewTestAPI::GetViewAt(int index) {
+  return shelf_view_->view_model_->view_at(index);
 }
 
 int ShelfViewTestAPI::GetFirstVisibleIndex() {
   return shelf_view_->first_visible_index_;
 }
 
 int ShelfViewTestAPI::GetLastVisibleIndex() {
   return shelf_view_->last_visible_index_;
 }
 
@@ skipping 104 matching lines @@
   return shelf_view_->dragged_off_from_overflow_to_shelf_;
 }
 
 ShelfButtonPressedMetricTracker*
 ShelfViewTestAPI::shelf_button_pressed_metric_tracker() {
   return &(shelf_view_->shelf_button_pressed_metric_tracker_);
 }
 
 }  // namespace test
 }  // namespace ash