Improving the process model extension API

chrome/browser/ui/gtk/task_manager_gtk.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 CHROME_BROWSER_UI_GTK_TASK_MANAGER_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TASK_MANAGER_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
@@ skipping 12 matching lines @@
 class TaskManagerGtk : public TaskManagerModelObserver {
  public:
   explicit TaskManagerGtk(bool highlight_background_resources);
   virtual ~TaskManagerGtk();
 
   // TaskManagerModelObserver
   virtual void OnModelChanged() OVERRIDE;
   virtual void OnItemsChanged(int start, int length) OVERRIDE;
   virtual void OnItemsAdded(int start, int length) OVERRIDE;
   virtual void OnItemsRemoved(int start, int length) OVERRIDE;
+  virtual void OnItemsToBeRemoved(int start, int length) OVERRIDE {}
 
   // Closes the task manager window.
   void Close();
 
   // Creates the task manager if it doesn't exist; otherwise, it activates the
   // existing task manager window. If |highlight_background_resources| is true,
   // background resources are rendered with a yellow highlight (for the
   // "View Background Pages" menu item).
   static void Show(bool highlight_background_resources);
 
@@ skipping 197 matching lines @@
   // ourselves caused.
   bool ignore_selection_changed_;
 
   // If true, background resources are rendered with a yellow highlight.
   bool highlight_background_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TASK_MANAGER_GTK_H_