components: Cleanup class/struct fwd declarations

components/favicon/core/fallback_icon_client.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_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_
 #define COMPONENTS_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_
 
 #include <string>
 #include <vector>
 
 #include "components/keyed_service/core/keyed_service.h"
 
-class GURL;
-
 namespace favicon {
 
 // This class abstracts operations that depend on the embedder's environment,
 // e.g. Chrome.
 class FallbackIconClient : public KeyedService {
  public:
   // Returns a list of font names for fallback icon rendering.
   virtual const std::vector<std::string>& GetFontNameList() const = 0;
 
  protected:
   ~FallbackIconClient() override {}
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FALLBACK_ICON_CLIENT_H_