PPAPI: Force async callback invocation option.

ppapi/proxy/ppb_broker_proxy.cc

 // Copyright (c) 2011 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 "ppapi/proxy/ppb_broker_proxy.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/trusted/ppb_broker_trusted.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
@@ skipping 186 matching lines @@
 }
 
 void PPB_Broker_Proxy::OnMsgCreate(PP_Instance instance,
                                    HostResource* result_resource) {
   result_resource->SetHostResource(
       instance,
       ppb_broker_target()->CreateTrusted(instance));
 }
 
 void PPB_Broker_Proxy::OnMsgConnect(const HostResource& broker) {
-  CompletionCallback callback = callback_factory_.NewCallback(
+  CompletionCallback callback = callback_factory_.NewOptionalCallback(
       &PPB_Broker_Proxy::ConnectCompleteInHost, broker);
 
   int32_t result = ppb_broker_target()->Connect(
       broker.host_resource(),
       callback.pp_completion_callback());
   if (result !=  PP_OK_COMPLETIONPENDING)
     callback.Run(result);
 }
 
 // Called in the plugin to handle the connect callback.
@@ skipping 54 matching lines @@
       // The easiest way to clean it up is to just put it in an object
       // and then close it. This failure case is not performance critical.
       // The handle could still leak if Send succeeded but the IPC later failed.
       base::SyncSocket temp_socket(
           IPC::PlatformFileForTransitToPlatformFile(foreign_socket_handle));
   }
 }
 
 }  // namespace proxy
 }  // namespace pp