components: Cleanup class/struct fwd declarations

components/dom_distiller/ios/distiller_page_ios.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 COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_
 #define COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_
 
 #include <memory>
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 #include "components/dom_distiller/core/distiller_page.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #include "url/gurl.h"
 
 namespace ios {
 class WebControllerProvider;
 }
 
 namespace web {
 class BrowserState;
-class WebState;
 }
 
 namespace dom_distiller {
 
 class DistillerWebStateObserver;
 
 // Loads URLs and injects JavaScript into a page, extracting the distilled page
 // content.
 class DistillerPageIOS : public DistillerPage {
  public:
@@ skipping 20 matching lines @@
   GURL url_;
   std::string script_;
   std::unique_ptr<ios::WebControllerProvider> provider_;
   std::unique_ptr<DistillerWebStateObserver> web_state_observer_;
   base::WeakPtrFactory<DistillerPageIOS> weak_ptr_factory_;
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_IOS_DISTILLER_PAGE_IOS_H_