fix a problem that android cannot download files with basic authentication

net/url_request/url_request.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_H_
 #define NET_URL_REQUEST_URL_REQUEST_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 577 matching lines @@
   // response to an OnReceivedRedirect call.
   void FollowDeferredRedirect();
 
   // One of the following two methods should be called in response to an
   // OnAuthRequired() callback (and only then).
   // SetAuth will reissue the request with the given credentials.
   // CancelAuth will give up and display the error page.
   void SetAuth(const AuthCredentials& credentials);
   void CancelAuth();
 
+  // Check whether the request has authentication credentials.
+  bool HasAuth() const;
+
   // This method can be called after the user selects a client certificate to
   // instruct this URLRequest to continue with the request with the
   // certificate.  Pass NULL if the user doesn't have a client certificate.
   void ContinueWithCertificate(X509Certificate* client_cert);
 
   // This method can be called after some error notifications to instruct this
   // URLRequest to ignore the current error and continue with the request.  To
   // cancel the request instead, call Cancel().
   void ContinueDespiteLastError();
 
@@ skipping 230 matching lines @@
   LoadTimingInfo load_timing_info_;
 
   scoped_ptr<const base::debug::StackTrace> stack_trace_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequest);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_H_