Remove FOR_EACH_OBSERVER macro usage in chrome/browser/sync_file_system

chrome/browser/sync_file_system/drive_backend/sync_engine.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 "chrome/browser/sync_file_system/drive_backend/sync_engine.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 730 matching lines @@
       weak_ptr_factory_(this) {
   DCHECK(sync_file_system_dir_.IsAbsolute());
   if (notification_manager_)
     notification_manager_->AddObserver(this);
   if (signin_manager_)
     signin_manager_->AddObserver(this);
   net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 }
 
 void SyncEngine::OnPendingFileListUpdated(int item_count) {
-  FOR_EACH_OBSERVER(
-      SyncServiceObserver,
-      service_observers_,
-      OnRemoteChangeQueueUpdated(item_count));
+  for (auto& observer : service_observers_)
+    observer.OnRemoteChangeQueueUpdated(item_count);
 }
 
 void SyncEngine::OnFileStatusChanged(const storage::FileSystemURL& url,
                                      SyncFileType file_type,
                                      SyncFileStatus file_status,
                                      SyncAction sync_action,
                                      SyncDirection direction) {
-  FOR_EACH_OBSERVER(FileStatusObserver,
-                    file_status_observers_,
-                    OnFileStatusChanged(
-                        url, file_type, file_status, sync_action, direction));
+  for (auto& observer : file_status_observers_) {
+    observer.OnFileStatusChanged(url, file_type, file_status, sync_action,
+                                 direction);
+  }
 }
 
 void SyncEngine::UpdateServiceState(RemoteServiceState state,
                                     const std::string& description) {
   service_state_ = state;
 
-  FOR_EACH_OBSERVER(
-      SyncServiceObserver, service_observers_,
-      OnRemoteServiceStateUpdated(GetCurrentState(), description));
+  for (auto& observer : service_observers_)
+    observer.OnRemoteServiceStateUpdated(GetCurrentState(), description);
 }
 
 SyncStatusCallback SyncEngine::TrackCallback(
     const SyncStatusCallback& callback) {
   return callback_tracker_.Register(
       base::Bind(callback, SYNC_STATUS_ABORT),
       callback);
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system