Convert the async device ID getter to a chrome resource host

content/browser/renderer_host/pepper/content_browser_pepper_host_factory.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/pepper/content_browser_pepper_host_factory.h"
 
 #include "content/browser/renderer_host/pepper/browser_ppapi_host_impl.h"
 #include "content/browser/renderer_host/pepper/pepper_gamepad_host.h"
 #include "ppapi/host/resource_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ skipping 11 matching lines @@
 }
 
 scoped_ptr<ResourceHost> ContentBrowserPepperHostFactory::CreateResourceHost(
     ppapi::host::PpapiHost* host,
     const ppapi::proxy::ResourceMessageCallParams& params,
     PP_Instance instance,
     const IPC::Message& message) {
   DCHECK(host == host_->GetPpapiHost());
 
   // Make sure the plugin is giving us a valid instance for this resource.
-  /* TODO(brettw) make this work. The browser should be aware of all valid
-     instances.
   if (!host_->IsValidInstance(instance))
     return scoped_ptr<ResourceHost>();
-  */
 
   // Public interfaces with no permissions required.
   switch (message.type()) {
     case PpapiHostMsg_Gamepad_Create::ID:
       return scoped_ptr<ResourceHost>(new PepperGamepadHost(
           host_, instance, params.pp_resource()));
   }
   return scoped_ptr<ResourceHost>();
 }
 
 }  // namespace content