Reduce usage of FOR_EACH_OBSERVER macro in components/

components/proximity_auth/cryptauth/fake_cryptauth_gcm_manager.cc

 // Copyright 2015 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 "components/proximity_auth/cryptauth/fake_cryptauth_gcm_manager.h"
 
 namespace proximity_auth {
 
 FakeCryptAuthGCMManager::FakeCryptAuthGCMManager(
     const std::string& registration_id)
@@ skipping 18 matching lines @@
 void FakeCryptAuthGCMManager::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void FakeCryptAuthGCMManager::CompleteRegistration(
     const std::string& registration_id) {
   DCHECK(registration_in_progress_);
   registration_in_progress_ = false;
   registration_id_ = registration_id;
   bool success = !registration_id_.empty();
-  FOR_EACH_OBSERVER(Observer, observers_, OnGCMRegistrationResult(success));
+  for (auto& observer : observers_)
+    observer.OnGCMRegistrationResult(success);
 }
 
 void FakeCryptAuthGCMManager::PushReenrollMessage() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnReenrollMessage());
+  for (auto& observer : observers_)
+    observer.OnReenrollMessage();
 }
 
 void FakeCryptAuthGCMManager::PushResyncMessage() {
-  FOR_EACH_OBSERVER(Observer, observers_, OnResyncMessage());
+  for (auto& observer : observers_)
+    observer.OnResyncMessage();
 }
 
 }  // namespace proximity_auth