Fix ResourceSchedulingFilter crash after ResourceDispatcher deleted

content/child/resource_scheduling_filter.h

 // Copyright (c) 2014 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 CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_
 #define CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 37 matching lines @@
   ~ResourceSchedulingFilter() override;
 
   using RequestIdToTaskRunnerMap =
       std::map<int, scoped_refptr<base::SingleThreadTaskRunner>>;
 
   // This lock guards |request_id_to_task_runner_map_|
   base::Lock request_id_to_task_runner_map_lock_;
   RequestIdToTaskRunnerMap request_id_to_task_runner_map_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
-  ResourceDispatcher* resource_dispatcher_;  // NOT OWNED
+  base::WeakPtr<ResourceDispatcher> resource_dispatcher_;
   base::WeakPtrFactory<ResourceSchedulingFilter> weak_ptr_factory_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ResourceSchedulingFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_RESOURCE_SCHEDULING_FILTER_H_