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

webkit/plugins/npapi/webplugin_delegate_impl.h

Index: webkit/plugins/npapi/webplugin_delegate_impl.h
===================================================================
--- webkit/plugins/npapi/webplugin_delegate_impl.h	(revision 110200)
+++ webkit/plugins/npapi/webplugin_delegate_impl.h	(working copy)
@@ -6,7 +6,7 @@
 #define WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_DELEGATE_IMPL_H_
 
 #include <string>
-#include <list>
+#include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
@@ -32,10 +32,6 @@
 
 class FilePath;
 
-namespace WebKit {
-class WebMouseEvent;
-}
-
 #if defined(OS_MACOSX)
 #ifdef __OBJC__
 @class CALayer;
@@ -237,7 +233,7 @@
   friend class WebPluginDelegate;
 
   WebPluginDelegateImpl(gfx::PluginWindowHandle containing_view,
-                        PluginInstance *instance);
+                        PluginInstance* instance);
   virtual ~WebPluginDelegateImpl();
 
   // Called by Initialize() for platform-specific initialization.