Change PluginInstance so it shuts down the NaCl Plugin when it uses the IPC PPAPI proxy.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
===================================================================
--- webkit/plugins/ppapi/ppapi_plugin_instance.cc	(revision 149708)
+++ webkit/plugins/ppapi/ppapi_plugin_instance.cc	(working copy)
@@ -403,6 +403,8 @@
   // destructor of the instance object tries to use the instance.
   message_channel_->SetPassthroughObject(NULL);
   instance_interface_->DidDestroy(pp_instance());
+  if (nacl_plugin_instance_interface_.get())
+    nacl_plugin_instance_interface_->DidDestroy(pp_instance());
 
   if (fullscreen_container_) {
     fullscreen_container_->Destroy();
@@ -2135,6 +2137,11 @@
 }
 
 bool PluginInstance::ResetAsProxied() {
+  // Remember the existing instance interface, so we can call DidDestroy in
+  // our Delete() method. This will delete the NaCl plugin instance, which
+  // will shut down the NaCl process.
+  nacl_plugin_instance_interface_.reset(instance_interface_.release());
+
   base::Callback<const void*(const char*)> get_plugin_interface_func =
       base::Bind(&PluginModule::GetPluginInterface, module_.get());
   PPP_Instance_Combined* ppp_instance_combined =