Remove FOR_EACH_OBSERVER macro usage in chrome/browser/sync_file_system

chrome/browser/sync_file_system/drive_backend/fake_sync_worker.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/sync_file_system/drive_backend/fake_sync_worker.h"
 
 #include <utility>
 
 #include "base/values.h"
 #include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
@@ skipping 114 matching lines @@
   sync_enabled_ = enabled;
 
   if (enabled)
     UpdateServiceState(REMOTE_SERVICE_OK, "Set FakeSyncWorker enabled.");
   else
     UpdateServiceState(REMOTE_SERVICE_DISABLED, "Disabled FakeSyncWorker.");
 }
 
 void FakeSyncWorker::PromoteDemotedChanges(const base::Closure& callback) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
-  FOR_EACH_OBSERVER(
-      Observer,
-      observers_,
-      OnPendingFileListUpdated(10));
+  for (auto& observer : observers_)
+    observer.OnPendingFileListUpdated(10);
   callback.Run();
 }
 
 void FakeSyncWorker::ApplyLocalChange(const FileChange& local_change,
                                       const base::FilePath& local_path,
                                       const SyncFileMetadata& local_metadata,
                                       const storage::FileSystemURL& url,
                                       const SyncStatusCallback& callback) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
   callback.Run(SYNC_STATUS_OK);
@@ skipping 16 matching lines @@
 
 void FakeSyncWorker::AddObserver(Observer* observer) {
   // This method is called on UI thread.
   observers_.AddObserver(observer);
 }
 
 void FakeSyncWorker::UpdateServiceState(RemoteServiceState state,
                                         const std::string& description) {
   DCHECK(sequence_checker_.CalledOnValidSequence());
 
-  FOR_EACH_OBSERVER(
-      Observer, observers_,
-      UpdateServiceState(state, description));
+  for (auto& observer : observers_)
+    observer.UpdateServiceState(state, description);
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system