ash: Remove unnecessary utility methods from ash::Shelf

ash/shelf/shelf_unittest.cc

 // Copyright 2013 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/shelf/shelf.h"
 
 #include <utility>
 
 #include "ash/common/shelf/shelf_button.h"
 #include "ash/common/shelf/shelf_model.h"
@@ skipping 90 matching lines @@
   ShelfButton* button = test_api()->GetButton(index);
   button->AddState(ShelfButton::STATE_HOVERED);
   button->ShowContextMenu(gfx::Point(), ui::MENU_SOURCE_MOUSE);
   EXPECT_FALSE(button->state() & ShelfButton::STATE_HOVERED);
 
   // Remove it.
   shelf_model()->RemoveItemAt(index);
 }
 
 TEST_F(ShelfTest, ShowOverflowBubble) {
+  ShelfWidget* shelf_widget = shelf()->shelf_widget();
   ShelfID first_item_id = shelf_model()->next_id();
 
   // Add platform app button until overflow.
   int items_added = 0;
   while (!test_api()->IsOverflowButtonVisible()) {
     ShelfItem item;
     item.type = TYPE_PLATFORM_APP;
     item.status = STATUS_RUNNING;
     shelf_model()->Add(item);
 
     ++items_added;
     ASSERT_LT(items_added, 10000);
   }
 
   // Shows overflow bubble.
   test_api()->ShowOverflowBubble();
-  EXPECT_TRUE(shelf()->IsShowingOverflowBubble());
+  EXPECT_TRUE(shelf_widget->IsShowingOverflowBubble());
 
   // Removes the first item in main shelf view.
   shelf_model()->RemoveItemAt(shelf_model()->ItemIndexByID(first_item_id));
 
   // Waits for all transitions to finish and there should be no crash.
   test_api()->RunMessageLoopUntilAnimationsDone();
-  EXPECT_FALSE(shelf()->IsShowingOverflowBubble());
+  EXPECT_FALSE(shelf_widget->IsShowingOverflowBubble());
 }
 
 }  // namespace ash