components: Cleanup class/struct fwd declarations

components/web_restrictions/browser/web_restrictions_resource_throttle.h

 // Copyright 2015 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_WEB_RESTRICTION_WEB_RESTRICTION_RESOURCE_THROTTLE_H_
 #define COMPONENTS_WEB_RESTRICTION_WEB_RESTRICTION_RESOURCE_THROTTLE_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/resource_throttle.h"
 #include "url/gurl.h"
 
-namespace net {
-class URLRequest;
-}
-
 namespace web_restrictions {
 
 class WebRestrictionsClient;
 
 class WebRestrictionsResourceThrottle : public content::ResourceThrottle {
  public:
   WebRestrictionsResourceThrottle(WebRestrictionsClient* provider,
                                   const GURL& request_url,
                                   bool is_main_frame);
   ~WebRestrictionsResourceThrottle() override;
@@ skipping 14 matching lines @@
   const GURL request_url_;
   bool is_main_frame_;
   base::WeakPtrFactory<WebRestrictionsResourceThrottle> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRestrictionsResourceThrottle);
 };
 
 }  // namespace web_restrictions
 
 #endif  // COMPONENTS_WEB_RESTRICTION_WEB_RESTRICTION_RESOURCE_THROTTLE_H_