chrome: Use stl utilities from the base namespace

chrome/browser/chromeos/file_manager/file_tasks.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 "chrome/browser/chromeos/file_manager/file_tasks.h"
 
 #include <stddef.h>
 
 #include <map>
 
@@ skipping 612 matching lines @@
         pref_service, mime_type, file_path.Extension());
     default_task_ids.insert(task_id);
   }
 
   // Go through all the tasks from the beginning and see if there is any
   // default task. If found, pick and set it as default and return.
   for (size_t i = 0; i < tasks->size(); ++i) {
     FullTaskDescriptor* task = &tasks->at(i);
     DCHECK(!task->is_default());
     const std::string task_id = TaskDescriptorToId(task->task_descriptor());
-    if (ContainsKey(default_task_ids, task_id)) {
+    if (base::ContainsKey(default_task_ids, task_id)) {
       task->set_is_default(true);
       return;
     }
   }
 
   // No default tasks found. If there is any fallback file browser handler,
   // make it as default task, so it's selected by default.
   for (size_t i = 0; i < tasks->size(); ++i) {
     FullTaskDescriptor* task = &tasks->at(i);
     DCHECK(!task->is_default());
     if (IsFallbackFileHandler(task->task_descriptor())) {
       task->set_is_default(true);
       return;
     }
   }
 }
 
 }  // namespace file_tasks
 }  // namespace file_manager