Refactor NaClProcessHost. Reduce chances to leak the resource.

components/nacl/renderer/pnacl_translation_resource_host.cc

 // Copyright 2013 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 "pnacl_translation_resource_host.h"
 
 #include "components/nacl/common/nacl_host_messages.h"
+#include "ipc/ipc_sender.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 
 using ppapi::PpapiGlobals;
 
 PnaclTranslationResourceHost::PnaclTranslationResourceHost(
     const scoped_refptr<base::MessageLoopProxy>& io_message_loop)
     : io_message_loop_(io_message_loop), sender_(NULL) {}
 
 PnaclTranslationResourceHost::~PnaclTranslationResourceHost() {
@@ skipping 124 matching lines @@
        ++it) {
     PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostTask(
         FROM_HERE,
         base::Bind(it->second,
                    static_cast<int32_t>(PP_ERROR_ABORTED),
                    false,
                    PP_kInvalidFileHandle));
   }
   pending_cache_requests_.clear();
 }