Allow ProxyService to share URLRequestContext with everything else.

net/proxy/mock_proxy_script_fetcher.h

Index: net/proxy/mock_proxy_script_fetcher.h
diff --git a/net/proxy/mock_proxy_script_fetcher.h b/net/proxy/mock_proxy_script_fetcher.h
index 458f477337bb11de3e243fb7652412b585b94c4a..8cf6cd5b2533aeeddc344953c617209782301d3a 100644
--- a/net/proxy/mock_proxy_script_fetcher.h
+++ b/net/proxy/mock_proxy_script_fetcher.h
@@ -27,6 +27,7 @@ class MockProxyScriptFetcher : public ProxyScriptFetcher {
             base::string16* text,
             const CompletionCallback& callback) override;
   void Cancel() override;
+  void OnShutdown() override;
   URLRequestContext* GetRequestContext() const override;
 
   void NotifyFetchCompletion(int result, const std::string& ascii_text);
@@ -41,6 +42,7 @@ class MockProxyScriptFetcher : public ProxyScriptFetcher {
   CompletionCallback pending_request_callback_;
   base::string16* pending_request_text_;
   bool waiting_for_fetch_;
+  bool is_shutdown_;
 };
 
 }  // namespace net