chrome: Use stl utilities from the base namespace

chrome/browser/media_galleries/linux/mtp_device_task_helper_map_service.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 "chrome/browser/media_galleries/linux/mtp_device_task_helper_map_service.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "chrome/browser/media_galleries/linux/mtp_device_task_helper.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 10 matching lines @@
   return g_mtp_device_task_helper_map_service.Pointer();
 }
 
 MTPDeviceTaskHelper* MTPDeviceTaskHelperMapService::CreateDeviceTaskHelper(
     const std::string& storage_name,
     const bool read_only) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(!storage_name.empty());
   const MTPDeviceTaskHelperKey key =
       GetMTPDeviceTaskHelperKey(storage_name, read_only);
-  DCHECK(!ContainsKey(task_helper_map_, key));
+  DCHECK(!base::ContainsKey(task_helper_map_, key));
   MTPDeviceTaskHelper* task_helper = new MTPDeviceTaskHelper();
   task_helper_map_[key] = task_helper;
   return task_helper;
 }
 
 void MTPDeviceTaskHelperMapService::DestroyDeviceTaskHelper(
     const std::string& storage_name,
     const bool read_only) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   const MTPDeviceTaskHelperKey key =
@@ skipping 23 matching lines @@
     const bool read_only) {
   return (read_only ? "ReadOnly" : "ReadWrite") + std::string("|") +
          storage_name;
 }
 
 MTPDeviceTaskHelperMapService::MTPDeviceTaskHelperMapService() {
 }
 
 MTPDeviceTaskHelperMapService::~MTPDeviceTaskHelperMapService() {
 }