linux: cleanup browser-side GtkSockets when plugins are destroyed

webkit/tools/test_shell/webview_host_gtk.cc

Index: webkit/tools/test_shell/webview_host_gtk.cc
diff --git a/webkit/tools/test_shell/webview_host_gtk.cc b/webkit/tools/test_shell/webview_host_gtk.cc
index cd491aff868a86c6f279c08b34f13dfaa172b57d..e089052df7bc1fc24121fe8e677cd24f5370d6f8 100644
--- a/webkit/tools/test_shell/webview_host_gtk.cc
+++ b/webkit/tools/test_shell/webview_host_gtk.cc
@@ -58,11 +58,16 @@ GtkWidget* WebViewHost::MapIDToWidget(GdkNativeWindow id) {
   return NULL;
 }
 
-gboolean WebViewHost::OnPlugRemoved(GtkSocket* socket) {
-  // Remove the socket's id from our list of widgets.
-  GdkNativeWindow id = gtk_socket_get_id(socket);
+void WebViewHost::OnPluginWindowDestroyed(GdkNativeWindow id) {
+  GtkWidget* plugin_container = MapIDToWidget(id);
+  if (!plugin_container)
+    return;
+
   native_window_to_widget_map_.erase(id);
+  gtk_widget_destroy(plugin_container);
+}
 
-  return FALSE;  // Destroy our widget.
+gboolean WebViewHost::OnPlugRemoved(GtkSocket* socket) {
+  return TRUE;  // Don't destroy our widget; we manage it ourselves.
 }