[ash/shelf] ResourceBundle should be used as pointer not non-const ref

ash/shelf/overflow_button.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/overflow_button.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_widget.h"
 #include "grit/ash_resources.h"
@@ skipping 19 matching lines @@
 
 const int kButtonHoverSize = 28;
 
 const int kBackgroundOffset = (48 - kButtonHoverSize) / 2;
 
 }  // namesapce
 
 OverflowButton::OverflowButton(views::ButtonListener* listener)
     : CustomButton(listener),
       bottom_image_(NULL) {
-  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
-  bottom_image_ = rb.GetImageNamed(IDR_ASH_SHELF_OVERFLOW).ToImageSkia();
-
+  ui::ResourceBundle* rb = &ui::ResourceBundle::GetSharedInstance();
+  bottom_image_ = rb->GetImageNamed(IDR_ASH_SHELF_OVERFLOW).ToImageSkia();
 
   SetAccessibilityFocusable(true);
   SetAccessibleName(l10n_util::GetStringUTF16(IDS_ASH_SHELF_OVERFLOW_NAME));
 }
 
 OverflowButton::~OverflowButton() {}
 
 void OverflowButton::OnShelfAlignmentChanged() {
   SchedulePaint();
 }
@@ skipping 89 matching lines @@
       image = bottom_image_;
       break;
   }
 
   canvas->DrawImageInt(*image,
                        bounds.x() + ((bounds.width() - image->width()) / 2),
                        bounds.y() + ((bounds.height() - image->height()) / 2));
 }
 
 }  // namespace ash