ui/base/models: convert usage of FOR_EACH_OBSERVER macro

ui/base/models/tree_node_model.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_BASE_MODELS_TREE_NODE_MODEL_H_
 #define UI_BASE_MODELS_TREE_NODE_MODEL_H_
 
 #include <stddef.h>
 
 #include <algorithm>
@@ skipping 211 matching lines @@
 
   std::unique_ptr<NodeType> Remove(NodeType* parent, NodeType* node) {
     DCHECK(parent);
     int index = parent->GetIndexOf(node);
     std::unique_ptr<NodeType> owned_node = parent->Remove(node);
     NotifyObserverTreeNodesRemoved(parent, index, 1);
     return owned_node;
   }
 
   void NotifyObserverTreeNodesAdded(NodeType* parent, int start, int count) {
-    FOR_EACH_OBSERVER(TreeModelObserver,
-                      observer_list_,
-                      TreeNodesAdded(this, parent, start, count));
+    for (TreeModelObserver& observer : observer_list_)
+      observer.TreeNodesAdded(this, parent, start, count);
   }
 
   void NotifyObserverTreeNodesRemoved(NodeType* parent, int start, int count) {
-    FOR_EACH_OBSERVER(TreeModelObserver,
-                      observer_list_,
-                      TreeNodesRemoved(this, parent, start, count));
+    for (TreeModelObserver& observer : observer_list_)
+      observer.TreeNodesRemoved(this, parent, start, count);
   }
 
   void NotifyObserverTreeNodeChanged(TreeModelNode* node) {
-    FOR_EACH_OBSERVER(TreeModelObserver,
-                      observer_list_,
-                      TreeNodeChanged(this, node));
+    for (TreeModelObserver& observer : observer_list_)
+      observer.TreeNodeChanged(this, node);
   }
 
   // TreeModel:
   NodeType* GetRoot() override {
     return root_.get();
   }
 
   int GetChildCount(TreeModelNode* parent) override {
     DCHECK(parent);
     return AsNode(parent)->child_count();
@@ skipping 35 matching lines @@
 
   // The root.
   std::unique_ptr<NodeType> root_;
 
   DISALLOW_COPY_AND_ASSIGN(TreeNodeModel);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_TREE_NODE_MODEL_H_