content: Use stl utilities from the base namespace

content/renderer/media/cdm/renderer_cdm_manager.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/renderer/media/cdm/renderer_cdm_manager.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/stl_util.h"
@@ skipping 215 matching lines @@
                                            const std::string& error_message) {
   ProxyMediaKeys* media_keys = GetMediaKeys(cdm_id);
   if (media_keys)
     media_keys->OnPromiseRejected(promise_id, exception, system_code,
                                   error_message);
 }
 
 int RendererCdmManager::RegisterMediaKeys(ProxyMediaKeys* media_keys) {
   int cdm_id = next_cdm_id_++;
   DCHECK_NE(cdm_id, media::CdmContext::kInvalidCdmId);
-  DCHECK(!ContainsKey(proxy_media_keys_map_, cdm_id));
+  DCHECK(!base::ContainsKey(proxy_media_keys_map_, cdm_id));
   proxy_media_keys_map_[cdm_id] = media_keys;
   return cdm_id;
 }
 
 void RendererCdmManager::UnregisterMediaKeys(int cdm_id) {
-  DCHECK(ContainsKey(proxy_media_keys_map_, cdm_id));
+  DCHECK(base::ContainsKey(proxy_media_keys_map_, cdm_id));
   proxy_media_keys_map_.erase(cdm_id);
 }
 
 ProxyMediaKeys* RendererCdmManager::GetMediaKeys(int cdm_id) {
   std::map<int, ProxyMediaKeys*>::iterator iter =
       proxy_media_keys_map_.find(cdm_id);
   return (iter != proxy_media_keys_map_.end()) ? iter->second : NULL;
 }
 
 }  // namespace content