Make old task manager tests work against new task manager.

chrome/browser/ui/task_manager/task_manager_table_model.h

 // Copyright 2015 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_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
 #define CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 83 matching lines @@
   // |columns_settings_| and updates the table view.
   void RetrieveSavedColumnsSettingsAndUpdateTable();
 
   // Stores the current values in |column_settings_| to the user prefs so that
   // it can be restored later next time the task manager view is opened.
   void StoreColumnsSettings();
 
   void ToggleColumnVisibility(int column_id);
 
  private:
+  friend class TaskManagerTester;
+
   // Start / stop observing the task manager.
   void StartUpdating();
   void StopUpdating();
 
   void OnRefresh();
 
   // Checks whether the task at |row_index| is the first task in its process
   // group of tasks.
   bool IsTaskFirstInGroup(int row_index) const;
 
@@ skipping 20 matching lines @@
 
   // The status of the flag #enable-nacl-debug.
   bool is_nacl_debugging_flag_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerTableModel);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_UI_TASK_MANAGER_TASK_MANAGER_TABLE_MODEL_H_