Cleanup: Remove unneeded forward declarations in webkit/plugins/.

webkit/plugins/ppapi/npapi_glue.h

 // Copyright (c) 2011 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 WEBKIT_PLUGINS_PPAPI_NPAPI_GLUE_H_
 #define WEBKIT_PLUGINS_PPAPI_NPAPI_GLUE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ppapi/c/pp_module.h"
 #include "ppapi/c/pp_var.h"
 
 struct NPObject;
 typedef struct _NPVariant NPVariant;
 typedef void* NPIdentifier;
 
 namespace webkit {
 namespace ppapi {
 
 class PluginInstance;
-class PluginModule;
 class PluginObject;
 
 // Utilities -------------------------------------------------------------------
 
 // Converts the given PP_Var to an NPVariant, returning true on success.
 // False means that the given variant is invalid. In this case, the result
 // NPVariant will be set to a void one.
 //
 // The contents of the PP_Var will be copied unless the PP_Var corresponds to
 // an object.
@@ skipping 240 matching lines @@
   bool has_exception_;
 
   // May be null if the consumer isn't interesting in catching exceptions.
   PP_Var* exception_;
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_NPAPI_GLUE_H_