content: Cleanup class/struct forward declarations

content/browser/frame_host/navigation_request_info.h

 // Copyright 2014 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_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "content/common/navigation_params.h"
 #include "content/common/resource_request_body_impl.h"
 #include "content/public/common/referrer.h"
 #include "url/gurl.h"
 #include "url/origin.h"
 
 namespace content {
-class ResourceRequestBody;
 
 // A struct to hold the parameters needed to start a navigation request in
 // ResourceDispatcherHost. It is initialized on the UI thread, and then passed
 // to the IO thread by a NavigationRequest object.
 struct CONTENT_EXPORT NavigationRequestInfo {
   NavigationRequestInfo(const CommonNavigationParams& common_params,
                         const BeginNavigationParams& begin_params,
                         const GURL& first_party_for_cookies,
                         const url::Origin& request_initiator,
                         bool is_main_frame,
@@ skipping 24 matching lines @@
   const int frame_tree_node_id;
 
   const bool is_for_guests_only;
 
   const bool report_raw_headers;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_