Create a about handler component.

Create a about handler component.
The following files ::
  chrome/browser/net/about_protocol_handler.*
  net/url_request/url_request_about_job.*
moved to new component: components/about_handler.
Also added GYP and GN file for same.

BUG=516695

Review URL: https://codereview.chromium.org/1284173003

Cr-Commit-Position: refs/heads/master@{#343366}

1 files changed, 35 insertions, 0 deletions

diff --git a/components/about_handler/url_request_about_job.h b/components/about_handler/url_request_about_job.h
new file mode 100644
index 0000000..e37c568
--- /dev/null
+++ b/components/about_handler/url_request_about_job.h
@@ -0,0 +1,35 @@
+// 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 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 about_handler {
+
+class URLRequestAboutJob : public net::URLRequestJob {
+ public:
+  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 about_handler
+
+#endif  // COMPONENTS_ABOUT_HANDLER_URL_REQUEST_ABOUT_JOB_H_