content: Use stl utilities from the base namespace

content/child/worker_thread_registry.cc

 // Copyright 2014 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 "content/child/worker_thread_registry.h"
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/lazy_instance.h"
@@ skipping 101 matching lines @@
   {
     base::AutoLock locker(task_runner_map_lock_);
     task_runner_map_.erase(WorkerThread::GetCurrentId());
   }
   delete observers;
   g_observers_tls.Pointer()->Set(nullptr);
 }
 
 base::TaskRunner* WorkerThreadRegistry::GetTaskRunnerFor(int worker_id) {
   base::AutoLock locker(task_runner_map_lock_);
-  return ContainsKey(task_runner_map_, worker_id)
+  return base::ContainsKey(task_runner_map_, worker_id)
              ? task_runner_map_[worker_id]
              : task_runner_for_dead_worker_.get();
 }
 
 bool WorkerThreadRegistry::PostTask(int id, const base::Closure& closure) {
   DCHECK(id > 0);
   base::AutoLock locker(task_runner_map_lock_);
   IDToTaskRunnerMap::iterator found = task_runner_map_.find(id);
   if (found == task_runner_map_.end())
     return false;
   return found->second->PostTask(FROM_HERE, closure);
 }
 
 }  // namespace content