content: Cleanup class/struct forward declarations

content/renderer/pepper/content_renderer_pepper_host_factory.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 CONTENT_RENDERER_PEPPER_CONTENT_RENDERER_PEPPER_HOST_FACTORY_H_
 #define CONTENT_RENDERER_PEPPER_CONTENT_RENDERER_PEPPER_HOST_FACTORY_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ppapi/host/host_factory.h"
 #include "ppapi/shared_impl/ppapi_permissions.h"
 
 namespace ppapi {
 class PpapiPermissions;
 }
 
 namespace content {
-class PepperInstanceStateAccessor;
 class RendererPpapiHostImpl;
-class RenderViewImpl;
 
 class ContentRendererPepperHostFactory : public ppapi::host::HostFactory {
  public:
   explicit ContentRendererPepperHostFactory(RendererPpapiHostImpl* host);
   ~ContentRendererPepperHostFactory() override;
 
   std::unique_ptr<ppapi::host::ResourceHost> CreateResourceHost(
       ppapi::host::PpapiHost* host,
       PP_Resource resource,
       PP_Instance instance,
       const IPC::Message& message) override;
 
  private:
   const ppapi::PpapiPermissions& GetPermissions() const;
 
   // Non-owning pointer.
   RendererPpapiHostImpl* host_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentRendererPepperHostFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_CONTENT_RENDERER_PEPPER_HOST_FACTORY_H_