Replace FOR_EACH_OBSERVER in chromeos/ with range-based for

chromeos/network/client_cert_resolver.cc

 // Copyright 2013 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 "chromeos/network/client_cert_resolver.h"
 
 #include <cert.h>
 #include <certt.h>  // for (SECCertUsageEnum) certUsageAnyCA
 #include <pk11pub.h>
 
@@ skipping 551 matching lines @@
   else
     ResolvePendingNetworks();
 }
 
 void ClientCertResolver::NotifyResolveRequestCompleted() {
   VLOG(2) << "Notify observers: " << (network_properties_changed_ ? "" : "no ")
           << "networks changed.";
   resolve_task_running_ = false;
   const bool changed = network_properties_changed_;
   network_properties_changed_ = false;
-  FOR_EACH_OBSERVER(Observer, observers_, ResolveRequestCompleted(changed));
+  for (auto& observer : observers_)
+    observer.ResolveRequestCompleted(changed);
 }
 
 base::Time ClientCertResolver::Now() const {
   if (testing_clock_)
     return testing_clock_->Now();
   return base::Time::Now();
 }
 
 }  // namespace chromeos