TaskManager: unique_ptr<> ownership of TaskGroups

chrome/browser/task_management/sampling/task_manager_impl.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_SAMPLING_TASK_MANAGER_IMPL_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_MANAGER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 107 matching lines @@
   TaskGroup* GetTaskGroupByTaskId(TaskId task_id) const;
   Task* GetTaskByTaskId(TaskId task_id) const;
 
   // Called back by a TaskGroup when the resource calculations done on the
   // background thread has completed.
   void OnTaskGroupBackgroundCalculationsDone();
 
   const base::Closure on_background_data_ready_callback_;
 
   // Map TaskGroups by the IDs of the processes they represent.
-  // Keys and values are unique (no duplicates).
-  std::map<base::ProcessId, TaskGroup*> task_groups_by_proc_id_;
+  std::map<base::ProcessId, std::unique_ptr<TaskGroup>> task_groups_by_proc_id_;
 
   // Map each task by its ID to the TaskGroup on which it resides.
   // Keys are unique but values will have duplicates (i.e. multiple tasks
   // running on the same process represented by a single TaskGroup).
   std::map<TaskId, TaskGroup*> task_groups_by_task_id_;
 
   // A cached sorted list of the task IDs.
   mutable std::vector<TaskId> sorted_task_ids_;
 
   // The manager of the IO thread helper used to handle network bytes
@@ skipping 16 matching lines @@
   // This will be set to true while there are observers and the task manager is
   // running.
   bool is_running_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerImpl);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_MANAGER_IMPL_H_