Show missing plug-in infobar only if a plug-in is available.

chrome/default_plugin/plugin_impl_gtk.cc

Index: chrome/default_plugin/plugin_impl_gtk.cc
diff --git a/chrome/default_plugin/plugin_impl_gtk.cc b/chrome/default_plugin/plugin_impl_gtk.cc
index e39a001b4060772b54fa06d3ac3ecf37474b31fd..801e57385be5cef0f3b5dc311aa5062693464179 100644
--- a/chrome/default_plugin/plugin_impl_gtk.cc
+++ b/chrome/default_plugin/plugin_impl_gtk.cc
@@ -49,8 +49,8 @@ bool PluginInstallerImpl::Initialize(void* module_handle, NPP instance,
   instance_ = instance;
   mime_type_ = mime_type;
 
-  return PluginInstallerBase::Initialize(module_handle, instance, mime_type,
-                                         argc, argn, argv);
+  PluginInstallerBase::SetRoutingIds(argc, argn, argv);
+  return true;
 }
 
 bool PluginInstallerImpl::NPP_SetWindow(NPWindow* window_info) {