Remove use of weakptr for RemovableDeviceNotificationsMac

chrome/browser/chrome_browser_main_mac.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.
 
 #include "chrome/browser/chrome_browser_main_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
@@ skipping 162 matching lines @@
   // Make sure the app controller has been created.
   DCHECK([NSApp delegate]);
 
   // Prevent Cocoa from turning command-line arguments into
   // |-application:openFiles:|, since we already handle them directly.
   [[NSUserDefaults standardUserDefaults]
       setObject:@"NO" forKey:@"NSTreatUnknownArgumentsAsOpen"];
 }
 
 void ChromeBrowserMainPartsMac::PreProfileInit() {
-  removable_device_notifications_mac_.reset(
-      new chrome::RemovableDeviceNotificationsMac());
+  removable_device_notifications_mac_ =
+      new chrome::RemovableDeviceNotificationsMac();
   ChromeBrowserMainPartsPosix::PreProfileInit();
 }
 
 void ChromeBrowserMainPartsMac::DidEndMainMessageLoop() {
   AppController* appController = [NSApp delegate];
   [appController didEndMainMessageLoop];
 }