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

net/base/proxy_delegate.h

Index: net/base/proxy_delegate.h
diff --git a/net/base/proxy_delegate.h b/net/base/proxy_delegate.h
index c16549c3cc8fb71b078401c9cb29a95f5b76706e..7e00d0ca8c79d98e606c0133e408e27046ed3c6f 100644
--- a/net/base/proxy_delegate.h
+++ b/net/base/proxy_delegate.h
@@ -56,6 +56,11 @@ class NET_EXPORT ProxyDelegate {
   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,