Use AuthCredentials throughout the network stack instead of username/password.

chrome/browser/extensions/extension_webrequest_api.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.
 
 #include "chrome/browser/extensions/extension_webrequest_api.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/json/json_writer.h"
@@ skipping 1678 matching lines @@
       }
       response_headers_string += '\n';
       response->response_headers_string.swap(response_headers_string);
     }
 
     if (value->HasKey(keys::kAuthCredentialsKey)) {
       DictionaryValue* credentials_value = NULL;
       EXTENSION_FUNCTION_VALIDATE(value->GetDictionary(
           keys::kAuthCredentialsKey,
           &credentials_value));
-      response->auth_credentials.reset(new net::AuthCredentials());
+      string16 username;
+      string16 password;
       EXTENSION_FUNCTION_VALIDATE(
-          credentials_value->GetString(keys::kUsernameKey,
-                                       &response->auth_credentials->username));
+          credentials_value->GetString(keys::kUsernameKey, &username));
       EXTENSION_FUNCTION_VALIDATE(
-          credentials_value->GetString(keys::kPasswordKey,
-                                       &response->auth_credentials->password));
+          credentials_value->GetString(keys::kPasswordKey, &password));
+      response->auth_credentials.reset(
+          new net::AuthCredentials(username, password));
     }
   }
 
   ExtensionWebRequestEventRouter::GetInstance()->OnEventHandled(
       profile_id(), extension_id(), event_name, sub_event_name, request_id,
       response.release());
 
   return true;
 }
 
@@ skipping 20 matching lines @@
       } else if ((*it)->name().find("AdBlock") != std::string::npos) {
         adblock = true;
       } else {
         other = true;
       }
     }
   }
 
   host->Send(new ExtensionMsg_UsingWebRequestAPI(adblock, adblock_plus, other));
 }