Revert "Make the proxy server HostPortPair available in document_state so that"

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index b99f8a0d556e9858c64ce244be4d0773e57d4f08..3ba2cb5dc10cab68a4416861be40045f7ab53a70 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2953,8 +2953,6 @@ void RenderFrameImpl::didReceiveResponse(
         extra_data->connection_info());
     document_state->set_was_fetched_via_proxy(
         extra_data->was_fetched_via_proxy());
-    document_state->set_proxy_server(
-        extra_data->proxy_server());
   }
   InternalDocumentStateData* internal_data =
       InternalDocumentStateData::FromDocumentState(document_state);