Add Needed Forward Declaration

content/renderer/npapi/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_NPAPI_WEBPLUGIN_IMPL_H_
 #define CONTENT_RENDERER_NPAPI_WEBPLUGIN_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 18 matching lines @@
 class IOSurfaceLayer;
 }
 
 namespace blink {
 class WebFrame;
 class WebLayer;
 class WebPluginContainer;
 class WebURLResponse;
 class WebURLLoader;
 class WebURLRequest;
+struct WebPluginParams;
 }
 
 namespace content {
 class MultipartResponseDelegate;
 class RenderFrameImpl;
 class RenderViewImpl;
 class WebPluginDelegateProxy;
 
 // This is the WebKit side of the plugin implementation that forwards calls,
 // after changing out of WebCore types, to a delegate.  The delegate may
@@ skipping 308 matching lines @@
   LoaderClient loader_client_;
 
   base::WeakPtrFactory<WebPluginImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPluginImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_NPAPI_WEBPLUGIN_IMPL_H_