Update from chromium https://crrev.com/302282

net/base/proxy_delegate.h

 // Copyright 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 NET_BASE_PROXY_DELEGATE_H_
 #define NET_BASE_PROXY_DELEGATE_H_
 
 #include "base/macros.h"
 #include "net/base/net_export.h"
 
@@ skipping 38 matching lines @@
   // OnCompleted or OnURLRequestDestroyed is called for this request.
   virtual void OnBeforeSendHeaders(URLRequest* request,
                                    const ProxyInfo& proxy_info,
                                    HttpRequestHeaders* headers) = 0;
 
   // Called immediately before a proxy tunnel request is sent.
   // Provides the embedder an opportunity to add extra request headers.
   virtual void OnBeforeTunnelRequest(const HostPortPair& proxy_server,
                                      HttpRequestHeaders* extra_headers) = 0;
 
+  // Called when the connect attempt to a CONNECT proxy has completed.
+  virtual void OnTunnelConnectCompleted(const HostPortPair& endpoint,
+                                        const HostPortPair& proxy_server,
+                                        int net_error) = 0;
+
   // Called after the response headers for the tunnel request are received.
   virtual void OnTunnelHeadersReceived(
       const HostPortPair& origin,
       const HostPortPair& proxy_server,
       const HttpResponseHeaders& response_headers) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };
 
 }
 
 #endif  // NET_BASE_PROXY_DELEGATE_H_