Replace more ObserverList with base::ObserverList.

ios/net/cookies/cookie_store_ios.mm

 // Copyright 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 "ios/net/cookies/cookie_store_ios.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 42 matching lines @@
   void RemoveObserver(CookieNotificationObserver* obs);
 
   // Notify the observers.
   void NotifyCookiesChanged();
   void NotifyCookiePolicyChanged();
 
  private:
   NotificationTrampoline();
   ~NotificationTrampoline();
 
-  ObserverList<CookieNotificationObserver> observer_list_;
+  base::ObserverList<CookieNotificationObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(NotificationTrampoline);
 
   static NotificationTrampoline* g_notification_trampoline;
 };
 
 #pragma mark NotificationTrampoline implementation
 
 NotificationTrampoline* NotificationTrampoline::GetInstance() {
   if (!g_notification_trampoline)
@@ skipping 878 matching lines @@
   DCHECK(thread_checker_.CalledOnValidThread());
   return base::Bind(&CookieStoreIOS::UpdateCachesAfterDelete, this, callback);
 }
 
 base::Closure CookieStoreIOS::WrapClosure(const base::Closure& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return base::Bind(&CookieStoreIOS::UpdateCachesAfterClosure, this, callback);
 }
 
 }  // namespace net