Reduce FOR_EACH_OBSERVER usage in extensions

extensions/browser/api/networking_private/networking_private_linux.cc

 // Copyright 2014 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 "extensions/browser/api/networking_private/networking_private_linux.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 1158 matching lines @@
     changed_networks->push_back(connected_network_guid);
   }
 
   PostOnNetworksChangedToUIThread(std::move(changed_networks));
   return true;
 }
 
 void NetworkingPrivateLinux::OnNetworksChangedEventOnUIThread(
     const GuidList& network_guids) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  FOR_EACH_OBSERVER(NetworkingPrivateDelegateObserver,
-                    network_events_observers_,
-                    OnNetworksChangedEvent(network_guids));
+  for (auto& observer : network_events_observers_)
+    observer.OnNetworksChangedEvent(network_guids);
 }
 
 void NetworkingPrivateLinux::OnNetworkListChangedEventOnUIThread(
     const GuidList& network_guids) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  FOR_EACH_OBSERVER(NetworkingPrivateDelegateObserver,
-                    network_events_observers_,
-                    OnNetworkListChangedEvent(network_guids));
+  for (auto& observer : network_events_observers_)
+    observer.OnNetworkListChangedEvent(network_guids);
 }
 
 void NetworkingPrivateLinux::PostOnNetworksChangedToUIThread(
     std::unique_ptr<GuidList> guid_list) {
   AssertOnDBusThread();
 
   content::BrowserThread::PostTask(
       content::BrowserThread::UI, FROM_HERE,
       base::Bind(&NetworkingPrivateLinux::OnNetworksChangedEventTask,
                  base::Unretained(this), base::Passed(&guid_list)));
 }
 
 void NetworkingPrivateLinux::OnNetworksChangedEventTask(
     std::unique_ptr<GuidList> guid_list) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   OnNetworksChangedEventOnUIThread(*guid_list);
 }
 
 }  // namespace extensions