Fix task concurrency in components/update_client

components/update_client/task_update.cc

 // Copyright 2015 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 "components/update_client/task_update.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 23 matching lines @@
   if (ids_.empty()) {
     RunComplete(-1);
     return;
   }
 
   update_engine_->Update(
       is_foreground_, ids_, crx_data_callback_,
       base::Bind(&TaskUpdate::RunComplete, base::Unretained(this)));
 }
 
+std::vector<std::string> TaskUpdate::GetIds() const {
+  return ids_;
+}
+
 void TaskUpdate::RunComplete(int error) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   callback_.Run(this, error);
 }
 
 }  // namespace update_client