Allow ProxyService to share URLRequestContext with everything else.

net/proxy/proxy_script_fetcher_impl.h

 // Copyright (c) 2012 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 NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_
 #define NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 35 matching lines @@
   size_t SetSizeConstraint(size_t size_bytes);
 
   void OnResponseCompleted(URLRequest* request, int net_error);
 
   // ProxyScriptFetcher methods:
   int Fetch(const GURL& url,
             base::string16* text,
             const CompletionCallback& callback) override;
   void Cancel() override;
   URLRequestContext* GetRequestContext() const override;
+  void OnShutdown() override;
 
   // URLRequest::Delegate methods:
   void OnAuthRequired(URLRequest* request,
                       AuthChallengeInfo* auth_info) override;
   void OnSSLCertificateError(URLRequest* request,
                              const SSLInfo& ssl_info,
                              bool is_hsts_ok) override;
   void OnResponseStarted(URLRequest* request, int net_error) override;
   void OnReadCompleted(URLRequest* request, int num_bytes) override;
 
@@ skipping 10 matching lines @@
   // Called once the request has completed to notify the caller of
   // |response_code_| and |response_text_|.
   void FetchCompleted();
 
   // Clear out the state for the current request.
   void ResetCurRequestState();
 
   // Callback for time-out task of request with id |id|.
   void OnTimeout(int id);
 
-  // The context used for making network requests.
-  URLRequestContext* const url_request_context_;
+  // The context used for making network requests.  Set to nullptr by
+  // OnShutdown.
+  URLRequestContext* url_request_context_;
 
   // Buffer that URLRequest writes into.
   scoped_refptr<IOBuffer> buf_;
 
   // The next ID to use for |cur_request_| (monotonically increasing).
   int next_id_;
 
   // The current (in progress) request, or NULL.
   std::unique_ptr<URLRequest> cur_request_;
 
@@ skipping 30 matching lines @@
   // Factory for creating the time-out task. This takes care of revoking
   // outstanding tasks when |this| is deleted.
   base::WeakPtrFactory<ProxyScriptFetcherImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyScriptFetcherImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SCRIPT_FETCHER_IMPL_H_