components: Cleanup class/struct fwd declarations

components/nacl/renderer/plugin/nacl_subprocess.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.
 
 // Instances of NaCl modules spun up within the plugin as a subprocess.
 // This may represent the "main" nacl module, or it may represent helpers
 // that perform various tasks within the plugin, for example,
 // a NaCl module for a compiler could be loaded to translate LLVM bitcode
 // into native code.
 
 #ifndef COMPONENTS_NACL_RENDERER_PLUGIN_NACL_SUBPROCESS_H_
 #define COMPONENTS_NACL_RENDERER_PLUGIN_NACL_SUBPROCESS_H_
 
 #include <stdarg.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "components/nacl/renderer/plugin/service_runtime.h"
 
 namespace plugin {
 
-class Plugin;
 class ServiceRuntime;
 
 
 // A class representing an instance of a NaCl module, loaded by the plugin.
 class NaClSubprocess {
  public:
   NaClSubprocess();
   virtual ~NaClSubprocess();
 
   ServiceRuntime* service_runtime() const { return service_runtime_.get(); }
   void set_service_runtime(ServiceRuntime* service_runtime) {
     service_runtime_.reset(service_runtime);
   }
 
   // Fully shut down the subprocess.
   void Shutdown();
 
  private:
   // The service runtime representing the NaCl module instance.
   std::unique_ptr<ServiceRuntime> service_runtime_;
 
   DISALLOW_COPY_AND_ASSIGN(NaClSubprocess);
 };
 
 }  // namespace plugin
 
 #endif  // COMPONENTS_NACL_RENDERER_PLUGIN_NACL_SUBPROCESS_H_