linux: cleanup browser-side GtkSockets when plugins are destroyed

webkit/tools/test_shell/webview_host.h

Index: webkit/tools/test_shell/webview_host.h
diff --git a/webkit/tools/test_shell/webview_host.h b/webkit/tools/test_shell/webview_host.h
index 0cd62ee9e134eeaa46869439e4d85464c0bf23fc..9c7c489bd7355e19643955551526d5d03c038d1e 100644
--- a/webkit/tools/test_shell/webview_host.h
+++ b/webkit/tools/test_shell/webview_host.h
@@ -41,6 +41,9 @@ class WebViewHost : public WebWidgetHost {
   // the GtkWidget hosting it.  Used when we get a message back from the
   // renderer indicating a plugin needs to move.
   GtkWidget* MapIDToWidget(GdkNativeWindow id);
+
+  // Called when a plugin has been destroyed.  Lets us clean up our side.
+  void OnPluginWindowDestroyed(GdkNativeWindow id);
 #endif
 
  protected: