Replace FOR_EACH_OBSERVER in components/drive with range-based for

components/drive/chromeos/directory_loader.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 "components/drive/chromeos/directory_loader.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/callback.h"
@@ skipping 543 matching lines @@
     const DirectoryFetchInfo& directory_fetch_info,
     const base::FilePath* directory_path,
     FileError error) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   DVLOG(1) << "Directory loaded: " << directory_fetch_info.ToString();
   OnDirectoryLoadComplete(directory_fetch_info.local_id(), error);
 
   // Also notify the observers.
   if (error == FILE_ERROR_OK && !directory_path->empty()) {
-    FOR_EACH_OBSERVER(ChangeListLoaderObserver,
-                      observers_,
-                      OnDirectoryReloaded(*directory_path));
+    for (auto& observer : observers_)
+      observer.OnDirectoryReloaded(*directory_path);
   }
 }
 
 }  // namespace internal
 }  // namespace drive