TaskManager: unique_ptr<> ownership of TaskGroups

chrome/browser/task_management/providers/web_contents/web_contents_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_WEB_CONTENTS_WEB_CONTENTS_TASK_PROVIDER_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_WEB_CONTENTS_WEB_CONTENTS_TASK_PROVIDER_H_
 
 #include <map>
 
 #include "base/macros.h"
@@ skipping 38 matching lines @@
   // task_management::TaskProvider:
   void StartUpdating() override;
   void StopUpdating() override;
 
   // Called when the given |web_contents| are destroyed so that we can delete
   // its associated entry.
   void DeleteEntry(content::WebContents* web_contents);
 
   // A map to associate a |WebContents| with its corresponding entry that we
   // create for it to be able to track it.
-  using EntryMap = std::map<content::WebContents*, WebContentsEntry*>;
-  EntryMap entries_map_;
+  std::map<content::WebContents*, std::unique_ptr<WebContentsEntry>>
+      entries_map_;
 
   // True if this provider is listening to WebContentsTags and updating its
   // observers, false otherwise.
   bool is_updating_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsTaskProvider);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_PROVIDERS_WEB_CONTENTS_WEB_CONTENTS_TASK_PROVIDER_H_