Treat QUIC proxy as a valid HTTP proxy.

net/http/http_network_transaction.cc

Index: net/http/http_network_transaction.cc
diff --git a/net/http/http_network_transaction.cc b/net/http/http_network_transaction.cc
index 8f33e20f3de4fc7845afade160064a802fe73de4..69a3aa58145e2b7d2f9a41505d59df253de560e5 100644
--- a/net/http/http_network_transaction.cc
+++ b/net/http/http_network_transaction.cc
@@ -571,7 +571,8 @@ bool HttpNetworkTransaction::is_https_request() const {
 }
 
 bool HttpNetworkTransaction::UsingHttpProxyWithoutTunnel() const {
-  return (proxy_info_.is_http() || proxy_info_.is_https()) &&
+  return (proxy_info_.is_http() || proxy_info_.is_https() ||
+          proxy_info_.is_quic()) &&

[bengr, 2015/02/03 23:03:08]

@rch: would proxy_info_.is_quic() return false if tunneled?

[Ryan Hamilton, 2015/02/03 23:06:50]

ProxyInfo doesn't know about any tunnel which might be used. It simply describes
the nature of the proxy (if any) that is being connected to. This method does
the "using a tunnel" detection.

(As far as I know)

          !(request_->url.SchemeIs("https") || request_->url.SchemeIsWSOrWSS());
 }