Reduce usage of FOR_EACH_OBSERVER macro in components/

components/proximity_auth/cryptauth/cryptauth_gcm_manager_impl.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/cryptauth_gcm_manager_impl.h"
 
 #include "base/bind.h"
 #include "base/strings/string_util.h"
 #include "components/gcm_driver/gcm_driver.h"
 #include "components/prefs/pref_service.h"
@@ skipping 84 matching lines @@
                << "  collapse_key: " << message.collapse_key << "\n"
                << "  data:\n    " << base::JoinString(fields, "\n    ");
 
   if (message.data.find(kRegistrationTickleTypeKey) == message.data.end()) {
     PA_LOG(WARNING) << "GCM message does not contain 'registrationTickleType'.";
   } else {
     std::string tickle_type = message.data.at(kRegistrationTickleTypeKey);
     if (tickle_type == kRegistrationTickleTypeForceEnrollment ||
         tickle_type == kRegistrationTickleTypeUpdateEnrollment) {
       // These tickle types correspond to re-enrollment messages.
-      FOR_EACH_OBSERVER(Observer, observers_, OnReenrollMessage());
+      for (auto& observer : observers_)
+        observer.OnReenrollMessage();
     } else if (tickle_type == kRegistrationTickleTypeDevicesSync) {
-      FOR_EACH_OBSERVER(Observer, observers_, OnResyncMessage());
+      for (auto& observer : observers_)
+        observer.OnResyncMessage();
     } else {
       PA_LOG(WARNING) << "Unknown tickle type in GCM message.";
     }
   }
 }
 
 void CryptAuthGCMManagerImpl::OnMessagesDeleted(const std::string& app_id) {
 }
 
 void CryptAuthGCMManagerImpl::OnSendError(
     const std::string& app_id,
     const gcm::GCMClient::SendErrorDetails& details) {
   NOTREACHED();
 }
 
 void CryptAuthGCMManagerImpl::OnSendAcknowledged(
     const std::string& app_id,
     const std::string& message_id) {
   NOTREACHED();
 }
 
 void CryptAuthGCMManagerImpl::OnRegistrationCompleted(
     const std::string& registration_id,
     gcm::GCMClient::Result result) {
   registration_in_progress_ = false;
   if (result != gcm::GCMClient::SUCCESS) {
     PA_LOG(WARNING) << "GCM registration failed with result="
                     << static_cast<int>(result);
-    FOR_EACH_OBSERVER(Observer, observers_, OnGCMRegistrationResult(false));
+    for (auto& observer : observers_)
+      observer.OnGCMRegistrationResult(false);
     return;
   }
 
   PA_LOG(INFO) << "GCM registration success, registration_id="
                << registration_id;
   pref_service_->SetString(prefs::kCryptAuthGCMRegistrationId, registration_id);
-  FOR_EACH_OBSERVER(Observer, observers_, OnGCMRegistrationResult(true));
+  for (auto& observer : observers_)
+    observer.OnGCMRegistrationResult(true);
 }
 
 }  // namespace proximity_auth