extensions: Cleanup class/struct fwd declarations

extensions/browser/api/declarative_webrequest/webrequest_action.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 EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_
 #define EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_
 
 #include <list>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "extensions/browser/api/declarative/declarative_rule.h"
 #include "extensions/browser/api/declarative_webrequest/request_stage.h"
 #include "extensions/browser/api/web_request/web_request_api_helpers.h"
 #include "extensions/common/api/events.h"
 #include "url/gurl.h"
 
-class WebRequestPermission;
-
 namespace base {
-class DictionaryValue;
 class Time;
 class Value;
 }
 
 namespace extension_web_request_api_helpers {
 struct EventResponseDelta;
 }
 
 namespace extensions {
 class Extension;
 class InfoMap;
 struct WebRequestData;
 }
 
-namespace net {
-class URLRequest;
-}
-
 namespace re2 {
 class RE2;
 }
 
 namespace extensions {
 
 typedef linked_ptr<extension_web_request_api_helpers::EventResponseDelta>
     LinkedPtrEventResponseDelta;
 
 // Base class for all WebRequestActions of the declarative Web Request API.
@@ skipping 407 matching lines @@
  private:
   ~WebRequestSendMessageToExtensionAction() override;
 
   std::string message_;
   DISALLOW_COPY_AND_ASSIGN(WebRequestSendMessageToExtensionAction);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_