Add file thread in MessageHostContext.

remoting/host/plugin/host_script_object.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 "remoting/host/plugin/host_script_object.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
@@ skipping 116 matching lines @@
     host_context_.reset();
   }
 
   worker_thread_.Stop();
 }
 
 bool HostNPScriptObject::Init() {
   DCHECK(plugin_message_loop_proxy_->BelongsToCurrentThread());
   VLOG(2) << "Init";
 
-  host_context_.reset(new ChromotingHostContext(NULL,
-                                                plugin_message_loop_proxy_));
+  host_context_.reset(new ChromotingHostContext(plugin_message_loop_proxy_));
   if (!host_context_->Start()) {
     host_context_.reset();
     return false;
   }
 
   nat_policy_.reset(
       policy_hack::NatPolicy::Create(host_context_->network_message_loop()));
   nat_policy_->StartWatching(
       base::Bind(&HostNPScriptObject::OnNatPolicyUpdate,
                  base::Unretained(this)));
@@ skipping 971 matching lines @@
   return is_good;
 }
 
 void HostNPScriptObject::SetException(const std::string& exception_string) {
   DCHECK(plugin_message_loop_proxy_->BelongsToCurrentThread());
   g_npnetscape_funcs->setexception(parent_, exception_string.c_str());
   LOG(INFO) << exception_string;
 }
 
 }  // namespace remoting