Reduce usage of FOR_EACH_OBSERVER macro in chrome/browser

chrome/browser/local_discovery/service_discovery_client_mdns.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 "chrome/browser/local_discovery/service_discovery_client_mdns.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 408 matching lines @@
 void ServiceDiscoveryClientMdns::OnMdnsInitialized(bool success) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!success) {
     ScheduleStartNewClient();
     return;
   }
   ReportSuccess();
 
   // Initialization is done, no need to delay tasks.
   need_dalay_mdns_tasks_ = false;
-  FOR_EACH_OBSERVER(Proxy, proxies_, OnNewMdnsReady());
+  for (Proxy& observer : proxies_)
+    observer.OnNewMdnsReady();
 }
 
 void ServiceDiscoveryClientMdns::ReportSuccess() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   UMA_HISTOGRAM_COUNTS_100("LocalDiscovery.ClientRestartAttempts",
                            restart_attempts_);
 }
 
 void ServiceDiscoveryClientMdns::OnBeforeMdnsDestroy() {
   need_dalay_mdns_tasks_ = true;
   weak_ptr_factory_.InvalidateWeakPtrs();
-  FOR_EACH_OBSERVER(Proxy, proxies_, OnMdnsDestroy());
+  for (Proxy& observer : proxies_)
+    observer.OnMdnsDestroy();
 }
 
 void ServiceDiscoveryClientMdns::DestroyMdns() {
   OnBeforeMdnsDestroy();
   // After calling |Proxy::OnMdnsDestroy| all references to client_ and mdns_
   // should be destroyed.
   if (client_)
     mdns_runner_->DeleteSoon(FROM_HERE, client_.release());
   if (mdns_)
     mdns_runner_->DeleteSoon(FROM_HERE, mdns_.release());
 }
 
 }  // namespace local_discovery