[net/http auth] Make HttpAuthHandler challenge handling asynchronous.

net/http/proxy_client_socket.cc

Index: net/http/proxy_client_socket.cc
diff --git a/net/http/proxy_client_socket.cc b/net/http/proxy_client_socket.cc
index 3094b436a20b5fd5ea4aeeb9ce45888393bb3875..12a517a27a9b81ac7b6eec8294245d62f5936573 100644
--- a/net/http/proxy_client_socket.cc
+++ b/net/http/proxy_client_socket.cc
@@ -57,18 +57,6 @@ void ProxyClientSocket::BuildTunnelRequest(
 }
 
 // static
-int ProxyClientSocket::HandleProxyAuthChallenge(HttpAuthController* auth,
-                                                HttpResponseInfo* response,
-                                                const BoundNetLog& net_log) {
-  DCHECK(response->headers.get());
-  int rv = auth->HandleAuthChallenge(response->headers, false, true, net_log);
-  response->auth_challenge = auth->auth_info();
-  if (rv == OK)
-    return ERR_PROXY_AUTH_REQUESTED;
-  return rv;
-}
-
-// static
 void ProxyClientSocket::LogBlockedTunnelResponse(int http_status_code,
                                                  bool is_https_proxy) {
   if (is_https_proxy) {
@@ -103,9 +91,7 @@ bool ProxyClientSocket::SanitizeProxyAuth(HttpResponseInfo* response) {
   CopyHeaderValues(old_headers, new_headers, "trailer");
   CopyHeaderValues(old_headers, new_headers, "transfer-encoding");
   CopyHeaderValues(old_headers, new_headers, "upgrade");
-
   CopyHeaderValues(old_headers, new_headers, "content-length");
-
   CopyHeaderValues(old_headers, new_headers, "proxy-authenticate");
 
   response->headers = new_headers;