Update from https://crrev.com/312398

net/websockets/websocket_stream.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/websockets/websocket_stream.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
@@ skipping 93 matching lines @@
     headers.SetHeader(HttpRequestHeaders::kConnection, websockets::kUpgrade);
     headers.SetHeader(HttpRequestHeaders::kOrigin, origin.string());
     headers.SetHeader(websockets::kSecWebSocketVersion,
                       websockets::kSupportedVersion);
     url_request_->SetExtraRequestHeaders(headers);
 
     // This passes the ownership of |create_helper_| to |url_request_|.
     url_request_->SetUserData(
         WebSocketHandshakeStreamBase::CreateHelper::DataKey(),
         create_helper_);
-    url_request_->SetLoadFlags(LOAD_DISABLE_CACHE |
-                               LOAD_BYPASS_CACHE |
-                               LOAD_DO_NOT_PROMPT_FOR_LOGIN);
+    url_request_->SetLoadFlags(LOAD_DISABLE_CACHE | LOAD_BYPASS_CACHE);
   }
 
   // Destroying this object destroys the URLRequest, which cancels the request
   // and so terminates the handshake if it is incomplete.
   ~StreamRequestImpl() override {}
 
   void Start(scoped_ptr<base::Timer> timer) {
     DCHECK(timer);
     TimeDelta timeout(TimeDelta::FromSeconds(
         kHandshakeTimeoutIntervalInSeconds));
@@ skipping 225 matching lines @@
     connect_delegate->OnFinishOpeningHandshake(make_scoped_ptr(
         new WebSocketHandshakeResponseInfo(url,
                                            headers->response_code(),
                                            headers->GetStatusText(),
                                            headers,
                                            response_time)));
   }
 }
 
 }  // namespace net