Remove wstrings from bookmarks, part 9.

app/tree_model.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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 APP_TREE_MODEL_H_
 #define APP_TREE_MODEL_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
+#include "base/string16.h"
 
 class SkBitmap;
 
 class TreeModel;
 
 // TreeModelNode --------------------------------------------------------------
 
 // Type of class returned from the model.
 class TreeModelNode {
  public:
   // Returns the title for the node.
+  // TODO(viettrungluu): remove wstring version and rename string16 version.
   virtual std::wstring GetTitle() const = 0;
+  virtual const string16& GetTitleAsString16() const = 0;
 
  protected:
   virtual ~TreeModelNode() {}
 };
 
 // Observer for the TreeModel. Notified of significant events to the model.
 class TreeModelObserver {
  public:
   // Notification that nodes were added to the specified parent.
   virtual void TreeNodesAdded(TreeModel* model,
@@ skipping 37 matching lines @@
 
   // Adds an observer of the model.
   virtual void AddObserver(TreeModelObserver* observer) = 0;
 
   // Removes an observer of the model.
   virtual void RemoveObserver(TreeModelObserver* observer) = 0;
 
   // Sets the title of the specified node.
   // This is only invoked if the node is editable and the user edits a node.
   virtual void SetTitle(TreeModelNode* node,
-                        const std::wstring& title) {
+                        const string16& title) {
     NOTREACHED();
   }
 
   // Returns the set of icons for the nodes in the tree. You only need override
   // this if you don't want to use the default folder icons.
   virtual void GetIcons(std::vector<SkBitmap>* icons) {}
 
   // Returns the index of the icon to use for |node|. Return -1 to use the
   // default icon. The index is relative to the list of icons returned from
   // GetIcons.
   virtual int GetIconIndex(TreeModelNode* node) { return -1; }
 
  protected:
   virtual ~TreeModel() {}
 };
 
 #endif  // APP_TREE_MODEL_H_