TaskManager: unique_ptr<> ownership of TaskGroups

chrome/browser/task_management/providers/child_process_task_provider.h

Index: chrome/browser/task_management/providers/child_process_task_provider.h
diff --git a/chrome/browser/task_management/providers/child_process_task_provider.h b/chrome/browser/task_management/providers/child_process_task_provider.h
index 0c61b68b92520b35f0ddf52fc0c83031dc2f3f18..398c6302a08654c6d6df04c0d67f0c10e32fe112 100644
--- a/chrome/browser/task_management/providers/child_process_task_provider.h
+++ b/chrome/browser/task_management/providers/child_process_task_provider.h
@@ -65,8 +65,8 @@ class ChildProcessTaskProvider
   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.
   //
@@ -80,8 +80,7 @@ class ChildProcessTaskProvider
   // 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.