Cleanup some forward declared structs that are not being used.

chrome/renderer/webplugin_delegate_proxy.h

Index: chrome/renderer/webplugin_delegate_proxy.h
===================================================================
--- chrome/renderer/webplugin_delegate_proxy.h	(revision 9264)
+++ chrome/renderer/webplugin_delegate_proxy.h	(working copy)
@@ -18,7 +18,6 @@
 #include "webkit/glue/webplugin_delegate.h"
 
 class GURL;
-struct PluginHostMsg_RouteToFrame_Params;
 struct PluginHostMsg_URLRequest_Params;
 class RenderView;
 class SkBitmap;
@@ -115,7 +114,8 @@
   void OnHandleURLRequest(const PluginHostMsg_URLRequest_Params& params);
   void OnCancelResource(int id);
   void OnInvalidateRect(const gfx::Rect& rect);
-  void OnGetWindowScriptNPObject(int route_id, bool* success, void** npobject_ptr);
+  void OnGetWindowScriptNPObject(int route_id, bool* success,
+                                 void** npobject_ptr);
   void OnGetPluginElement(int route_id, bool* success, void** npobject_ptr);
   void OnSetCookie(const GURL& url,
                    const GURL& policy_url,
@@ -194,5 +194,4 @@
   DISALLOW_EVIL_CONSTRUCTORS(WebPluginDelegateProxy);
 };
 
-#endif  // #ifndef CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H__
-
+#endif  // CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H_