Fixes extension packing codepath that was hitting a race condition DCHECK des...

chrome/browser/extensions/pack_extension_job.cc

 // Copyright (c) 2009 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 "chrome/browser/extensions/pack_extension_job.h"
 
 #include "base/message_loop.h"
 #include "base/string_util.h"
 #include "base/task.h"
 #include "chrome/browser/extensions/extension_creator.h"
 
 PackExtensionJob::PackExtensionJob(Client* client,
                                    const FilePath& root_directory,
                                    const FilePath& key_file)
     : client_(client), root_directory_(root_directory), key_file_(key_file) {
   CHECK(ChromeThread::GetCurrentThreadIdentifier(&client_thread_id_));
+}
+
+void PackExtensionJob::Start() {
   ChromeThread::PostTask(
       ChromeThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &PackExtensionJob::RunOnFileThread));
 }
 
 void PackExtensionJob::ClearClient() {
   client_ = NULL;
 }
 
 void PackExtensionJob::RunOnFileThread() {
@@ skipping 20 matching lines @@
 
 void PackExtensionJob::ReportSuccessOnUIThread() {
   if (client_)
     client_->OnPackSuccess(crx_file_out_, key_file_out_);
 }
 
 void PackExtensionJob::ReportFailureOnUIThread(const std::string& error) {
   if (client_)
     client_->OnPackFailure(UTF8ToWide(error));
 }