Reduce usage of FOR_EACH_OBSERVER macro in components/

components/undo/undo_manager.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 "components/undo/undo_manager.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/logging.h"
@@ skipping 185 matching lines @@
       active_undo_group->begin() + active_undo_group->size() - 1);
 
   StartGroupingActions();
   action->Undo();
   EndGroupingActions();
 
   NotifyOnUndoManagerStateChange();
 }
 
 void UndoManager::NotifyOnUndoManagerStateChange() {
-  FOR_EACH_OBSERVER(
-      UndoManagerObserver, observers_, OnUndoManagerStateChange());
+  for (auto& observer : observers_)
+    observer.OnUndoManagerStateChange();
 }
 
 void UndoManager::AddUndoGroup(UndoGroup* new_undo_group) {
   GetActiveUndoGroup()->push_back(new_undo_group);
 
   // User actions invalidate any available redo actions.
   if (is_user_action())
     redo_actions_.clear();
 
   // Limit the number of undo levels so the undo stack does not grow unbounded.
   if (GetActiveUndoGroup()->size() > kMaxUndoGroups)
     GetActiveUndoGroup()->erase(GetActiveUndoGroup()->begin());
 
   NotifyOnUndoManagerStateChange();
 }
 
 ScopedVector<UndoGroup>* UndoManager::GetActiveUndoGroup() {
   return performing_undo_ ? &redo_actions_ : &undo_actions_;
 }