chrome: Use stl utilities from the base namespace

chrome/browser/download/download_request_limiter.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/download/download_request_limiter.h"
 
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
@@ skipping 451 matching lines @@
       break;
     }
 
     default:
       NOTREACHED();
   }
 }
 
 void DownloadRequestLimiter::Remove(TabDownloadState* state,
                                     content::WebContents* contents) {
-  DCHECK(ContainsKey(state_map_, contents));
+  DCHECK(base::ContainsKey(state_map_, contents));
   state_map_.erase(contents);
   delete state;
 }