Refactor and fix declarative webRequest API permissions

chrome/browser/extensions/api/web_request/web_request_permissions.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 CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_PERMISSIONS_H_
+#define CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_PERMISSIONS_H_
+
+#include <map>
+#include <string>
+
+#include "base/basictypes.h"
+
+class ExtensionInfoMap;
+class GURL;
+
+namespace net {
+class URLRequest;
+}
+
+// This class is used to test whether extensions may modify web requests.
+class WebRequestPermissions {
+ public:
+  // Returns true if the request shall not be reported to extensions.
+  static bool HideRequest(const net::URLRequest* request);
+
+  static bool CanExtensionAccessURL(const ExtensionInfoMap* extension_info_map,
+                                    const std::string& extension_id,
+                                    const GURL& url,
+                                    bool crosses_incognito,
+                                    bool enforce_host_permissions);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebRequestPermissions);
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_PERMISSIONS_H_