Turn NULL used as int to 0.

webkit/tools/test_shell/webwidget_host_gtk.cc

Index: webkit/tools/test_shell/webwidget_host_gtk.cc
diff --git a/webkit/tools/test_shell/webwidget_host_gtk.cc b/webkit/tools/test_shell/webwidget_host_gtk.cc
index 97dd3f87ae89066e5c02170194deb23169623b27..f9d23a1d95b573c7028057c3c84b178af3beabee 100644
--- a/webkit/tools/test_shell/webwidget_host_gtk.cc
+++ b/webkit/tools/test_shell/webwidget_host_gtk.cc
@@ -319,7 +319,7 @@ WebWidgetHost::~WebWidgetHost() {
   // attempt to invoke something on a deleted object.
   g_object_set_data(G_OBJECT(view_), kWebWidgetHostKey, NULL);
   g_signal_handlers_disconnect_matched(view_,
-      G_SIGNAL_MATCH_DATA, 0, NULL, NULL, NULL, this);
+      G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, this);
   webwidget_->close();
 }