Send fatal proxy errors to the network delegate.

net/http/http_network_delegate.h

Index: net/http/http_network_delegate.h
diff --git a/net/http/http_network_delegate.h b/net/http/http_network_delegate.h
index 1533bc3711e818b2db4b68f52dce113b2ec6a9a2..2d363cf7766c5da63d8c1fc1d504cdd0632c64f5 100644
--- a/net/http/http_network_delegate.h
+++ b/net/http/http_network_delegate.h
@@ -20,6 +20,12 @@ class HttpNetworkDelegate {
   // read/write |headers| before they get sent out.
   virtual void OnSendHttpRequest(HttpRequestHeaders* headers) = 0;
 
+  // Called right after the response started.
+  virtual void OnResponseStarted(net::URLRequest* request) = 0;
+
+  // Called when the Read of the response body is completed.

[willchan no longer on Chromium, 2011/02/21 23:35:39]

You should say this corresponds to URLRequest::Delegate::Read(). Otherwise, you
need to note here that bytes_read is -1 when an error occurs, and the
URLRequestStatus will be updated.

+  virtual void OnReadCompleted(net::URLRequest* request, int bytes_read) = 0;
+
  protected:
   virtual ~HttpNetworkDelegate() {}
 };