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

chrome/default_plugin/plugin_impl_mac.mm

Index: chrome/default_plugin/plugin_impl_mac.mm
diff --git a/chrome/default_plugin/plugin_impl_mac.mm b/chrome/default_plugin/plugin_impl_mac.mm
index 927c32f940d2271b07be84b8a9b48fa0dec250e2..36a7dfddaee0ee45da4615327f1b8fa379483baa 100644
--- a/chrome/default_plugin/plugin_impl_mac.mm
+++ b/chrome/default_plugin/plugin_impl_mac.mm
@@ -57,8 +57,8 @@ bool PluginInstallerImpl::Initialize(void* module_handle, NPP instance,
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   image_ = rb.GetNativeImageNamed(IDR_PLUGIN_ICON);
 
-  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) {