TaskManager: unique_ptr<> ownership of TaskGroups

chrome/browser/task_management/providers/child_process_task_provider.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_PROVIDERS_CHILD_PROCESS_TASK_PROVIDER_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_CHILD_PROCESS_TASK_PROVIDER_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 47 matching lines @@
 
   // Creates a ChildProcessTask from the given |data| and notifies the observer
   // of its addition.
   void CreateTask(const content::ChildProcessData& data);
 
   // Deletes a ChildProcessTask whose |handle| is provided after notifying the
   // observer of its deletion.
   void DeleteTask(base::ProcessHandle handle);
 
   // A map to track ChildProcessTask's by their handles.
-  using HandleToTaskMap = std::map<base::ProcessHandle, ChildProcessTask*>;
-  HandleToTaskMap tasks_by_handle_;
+  std::map<base::ProcessHandle, std::unique_ptr<ChildProcessTask>>
+      tasks_by_handle_;
 
   // A map to track ChildProcessTask's by their PIDs.
   //
   // Why have both |tasks_by_handle_| and |tasks_by_pid_|? On Windows, where
   // handles are not the same as PIDs, |DeleteTask| gets only a handle, which
   // may be closed, making it impossible to query the PID from the handle. So
   // we need an index on the handle. Meanwhile, we also need an index on the
   // PID so that we can efficiently implement |GetTaskOfUrlRequest()|, which
   // gets only a PID.
   //
   // TODO(afakhry): Fix this either by keeping the handle open via
   // |base::Process|, or amending the |BrowserChildProcessObserver| interface to
   // supply the PID.
-  using PidToTaskMap = std::map<base::ProcessId, ChildProcessTask*>;
-  PidToTaskMap tasks_by_pid_;
+  std::map<base::ProcessId, ChildProcessTask*> tasks_by_pid_;
 
   // Always keep this the last member of this class to make sure it's the
   // first thing to be destructed.
   base::WeakPtrFactory<ChildProcessTaskProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessTaskProvider);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_CHILD_PROCESS_TASK_PROVIDER_H_