Stop login prompt from showing for prefetches

chrome/browser/renderer_host/resource_dispatcher_host.cc

 // Copyright (c) 2011 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <set>
 #include <vector>
@@ skipping 1022 matching lines @@
       info->replace_extension_localization_templates(), response);
   if (!info->resource_handler()->OnRequestRedirected(info->request_id(),
                                                      new_url,
                                                      response, defer_redirect))
     CancelRequestInternal(request, false);
 }
 
 void ResourceDispatcherHost::OnAuthRequired(
     net::URLRequest* request,
     net::AuthChallengeInfo* auth_info) {
+  if (request->load_flags() & net::LOAD_PREFETCH) {
+    request->CancelAuth();
+    return;
+  }
   // Create a login dialog on the UI thread to get authentication data,
   // or pull from cache and continue on the IO thread.
   // TODO(mpcomplete): We should block the parent tab while waiting for
   // authentication.
   // That would also solve the problem of the net::URLRequest being cancelled
   // before we receive authentication.
   ResourceDispatcherHostRequestInfo* info = InfoForRequest(request);
   DCHECK(!info->login_handler()) <<
       "OnAuthRequired called with login_handler pending";
   info->set_login_handler(CreateLoginPrompt(auth_info, request));
@@ skipping 894 matching lines @@
   return is_prefetch_enabled_;
 }
 
 // static
 void ResourceDispatcherHost::set_is_prefetch_enabled(bool value) {
   is_prefetch_enabled_ = value;
 }
 
 // static
 bool ResourceDispatcherHost::is_prefetch_enabled_ = false;