NetworkService: Destroy URLLoaders when a NetworkContext is destroyed.

content/network/url_loader_impl.h

 // Copyright 2017 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_NETWORK_URL_LOADER_IMPL_H_
 #define CONTENT_NETWORK_URL_LOADER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 30 matching lines @@
   void SetPriority(net::RequestPriority priority,
                    int32_t intra_priority_value) override;
 
   // net::URLRequest::Delegate methods:
   void OnReceivedRedirect(net::URLRequest* url_request,
                           const net::RedirectInfo& redirect_info,
                           bool* defer_redirect) override;
   void OnResponseStarted(net::URLRequest* url_request, int net_error) override;
   void OnReadCompleted(net::URLRequest* url_request, int bytes_read) override;
 
+  // Returns a WeakPtr so tests can validate that the object was destroyed.
+  base::WeakPtr<URLLoaderImpl> GetWeakPtrForTests();
+
  private:
   void ReadMore();
   void DidRead(uint32_t num_bytes, bool completed_synchronously);
   void NotifyCompleted(int error_code);
   void OnConnectionError();
   void OnResponseBodyStreamClosed(MojoResult result);
   void OnResponseBodyStreamReady(MojoResult result);
   void DeleteIfNeeded();
 
   NetworkContext* context_;
   int32_t options_;
   bool connected_;
   std::unique_ptr<net::URLRequest> url_request_;
   mojo::AssociatedBinding<mojom::URLLoader> binding_;
   mojom::URLLoaderClientPtr url_loader_client_;
 
   mojo::ScopedDataPipeProducerHandle response_body_stream_;
   scoped_refptr<NetToMojoPendingBuffer> pending_write_;
   mojo::SimpleWatcher writable_handle_watcher_;
   mojo::SimpleWatcher peer_closed_handle_watcher_;
 
   base::WeakPtrFactory<URLLoaderImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLLoaderImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_NETWORK_URL_LOADER_IMPL_H_