Implement chrome://network-error with network service.

content/browser/webui/url_data_manager_backend.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 CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_BACKEND_H_
 #define CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_BACKEND_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 59 matching lines @@
       const std::string& path,
       const std::string& origin);
 
   // Returns whether |url| passes some sanity checks and is a valid GURL.
   static bool CheckURLIsValid(const GURL& url);
 
   // Parse |url| to get the path which will be used to resolve the request. The
   // path is the remaining portion after the scheme and hostname.
   static void URLToRequestPath(const GURL& url, std::string* path);
 
+  // Check if the given integer is a valid network error code.
+  static bool IsValidNetworkErrorCode(int error_code);
+
   // Returns the schemes that are used by WebUI (i.e. the set from content and
   // its embedder).
   static std::vector<std::string> GetWebUISchemes();
 
  private:
   friend class URLRequestChromeJob;
 
   typedef std::map<std::string,
       scoped_refptr<URLDataSourceImpl> > DataSourceMap;
   typedef std::map<RequestID, URLRequestChromeJob*> PendingRequestMap;
@@ skipping 33 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(URLDataManagerBackend);
 };
 
 // Creates protocol handler for chrome-devtools://.
 net::URLRequestJobFactory::ProtocolHandler* CreateDevToolsProtocolHandler(
     ResourceContext* resource_context);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEBUI_URL_DATA_MANAGER_BACKEND_H_