Move the Mac Task Manager to the new backend code.

chrome/browser/task_management/task_manager_interface.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_TASK_MANAGEMENT_TASK_MANAGER_INTERFACE_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_INTERFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 27 matching lines @@
 // Concrete implementations have no control over the refresh rate nor the
 // enabled calculations of the usage of the various resources.
 class TaskManagerInterface {
  public:
   // Registers the task manager related prefs.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // Returns true if the user is allowed to end processes.
   static bool IsEndProcessEnabled();
 
-#if defined(OS_MACOSX)
-  // On Mac OS, the old task manager is still being used on cocoa.
-  static bool IsNewTaskManagerEnabled();
-#endif  // defined(OS_MACOSX)
-
   // Gets the existing instance of the task manager if any, otherwise it will
   // create it first. Must be called on the UI thread.
   static TaskManagerInterface* GetTaskManager();
 
   // This notification will be received on the IO thread from
   // ChromeNetworkDelegate to update the task manager with network usage.
   static void OnRawBytesRead(const net::URLRequest& request,
                              int64_t bytes_read);
 
   void AddObserver(TaskManagerObserver* observer);
@@ skipping 212 matching lines @@
 
   // The flags containing the enabled resources types calculations.
   int64_t enabled_resources_flags_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerInterface);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_INTERFACE_H_