Fix up instance registration with the browser.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index e77101af10e533e53884a4708b963836c6874ba5..7e4fa31c239a7dd30db945cc360662513b0966d4 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -489,6 +489,8 @@ PluginInstance::~PluginInstance() {
   if (original_module_.get())
     original_module_->InstanceDeleted(this);
 
+  // This should be last since some of the above "instance deleted" calls will
+  // want to look up in the global map to get info off of our object.
   HostGlobals::Get()->InstanceDeleted(pp_instance_);
 }