Use scoped_ptr<> to store ConfirmBubbleModel.

chrome/browser/ui/cocoa/confirm_bubble_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/confirm_bubble_controller.h"
 
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #import "chrome/browser/ui/cocoa/confirm_bubble_view.h"
 #import "chrome/browser/ui/confirm_bubble_model.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/point.h"
 
 @implementation ConfirmBubbleController
 
 - (id)initWithParent:(NSView*)parent
               origin:(CGPoint)origin
                model:(ConfirmBubbleModel*)model {
   if ((self = [super initWithNibName:nil bundle:nil])) {
     parent_ = parent;
     origin_ = origin;
-    model_ = model;
+    model_.reset(model);
   }
   return self;
 }
 
 - (void)loadView {
   [self setView:[[[ConfirmBubbleView alloc] initWithParent:parent_
                                                 controller:self] autorelease]];
 }
 
 - (void)windowWillClose:(NSNotification*)notification {
@@ skipping 48 matching lines @@
 
 - (void)cancel {
   model_->Cancel();
 }
 
 - (void)linkClicked {
   model_->LinkClicked();
 }
 
 @end