content: Cleanup class/struct forward declarations

content/renderer/pepper/pepper_webplugin_impl.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_PEPPER_WEBPLUGIN_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_WEBPLUGIN_IMPL_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "ppapi/c/pp_var.h"
 #include "third_party/WebKit/public/web/WebPlugin.h"
 #include "ui/gfx/geometry/rect.h"
 
-struct _NPP;
-
 namespace blink {
 struct WebPluginParams;
 struct WebPrintParams;
 }
 
 namespace content {
 
 class PepperPluginInstanceImpl;
 class PluginInstanceThrottlerImpl;
 class PluginModule;
-class PPB_URLLoader_Impl;
 class RenderFrameImpl;
 
 class PepperWebPluginImpl : public blink::WebPlugin {
  public:
   PepperWebPluginImpl(PluginModule* module,
                       const blink::WebPluginParams& params,
                       RenderFrameImpl* render_frame,
                       std::unique_ptr<PluginInstanceThrottlerImpl> throttler);
 
   PepperPluginInstanceImpl* instance() { return instance_.get(); }
@@ skipping 57 matching lines @@
   gfx::Rect plugin_rect_;
   PP_Var instance_object_;
   blink::WebPluginContainer* container_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperWebPluginImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_WEBPLUGIN_IMPL_H_