linux plugins: eliminate GtkWidget* from plugin process

chrome/plugin/webplugin_proxy.cc

Index: chrome/plugin/webplugin_proxy.cc
diff --git a/chrome/plugin/webplugin_proxy.cc b/chrome/plugin/webplugin_proxy.cc
index 286659b9a5fbeb3ce2af27f3e9868c3fdd27d8aa..57c07fc16fba3d32f35641649479fd8f86b03162 100644
--- a/chrome/plugin/webplugin_proxy.cc
+++ b/chrome/plugin/webplugin_proxy.cc
@@ -56,15 +56,21 @@ bool WebPluginProxy::Send(IPC::Message* msg) {
   return channel_->Send(msg);
 }
 
-void WebPluginProxy::SetWindow(gfx::NativeView window) {
+void WebPluginProxy::SetWindow(gfx::PluginWindowHandle window) {
+#if defined(OS_WIN)
   Send(new PluginHostMsg_SetWindow(route_id_, gfx::IdFromNativeView(window)));
+#else
+  NOTIMPLEMENTED();
+#endif
 }
 
-void WebPluginProxy::WillDestroyWindow(gfx::NativeView window) {
+void WebPluginProxy::WillDestroyWindow(gfx::PluginWindowHandle window) {
 #if defined(OS_WIN)
   PluginThread::current()->Send(
       new PluginProcessHostMsg_PluginWindowDestroyed(
           window, ::GetParent(window)));
+#else
+  NOTIMPLEMENTED();
 #endif
 }