Create a about handler component.

components/about_handler/url_request_about_job.h

 // 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.
 
-#ifndef NET_URL_REQUEST_URL_REQUEST_ABOUT_JOB_H_
-#define NET_URL_REQUEST_URL_REQUEST_ABOUT_JOB_H_
+#ifndef COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_
+#define COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_job.h"
 
-namespace net {
+namespace about_handler {
 
-class NET_EXPORT URLRequestAboutJob : public URLRequestJob {
+class NET_EXPORT URLRequestAboutJob : public net::URLRequestJob {

[droger, 2015/08/13 12:06:12]

Remove NET_EXPORT

[Jitu( very slow this week), 2015/08/13 14:15:03]

Done.

  public:
-  URLRequestAboutJob(URLRequest* request, NetworkDelegate* network_delegate);
+  URLRequestAboutJob(net::URLRequest* request,
+                     net::NetworkDelegate* network_delegate);
 
   // URLRequestJob:
   void Start() override;
   bool GetMimeType(std::string* mime_type) const override;
 
  private:
   ~URLRequestAboutJob() override;
 
   void StartAsync();
 
   base::WeakPtrFactory<URLRequestAboutJob> weak_factory_;
 };
 
-}  // namespace net
+}  // namespace about_handler
 
-#endif  // NET_URL_REQUEST_URL_REQUEST_ABOUT_JOB_H_
+#endif  // COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_