components: Use stl utilities from the base namespace

components/storage_monitor/media_transfer_protocol_device_observer_linux.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 "components/storage_monitor/media_transfer_protocol_device_observer_linux.h"
 
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/stl_util.h"
@@ skipping 192 matching lines @@
                            &device_id, &storage_label, &location,
                            &vendor_name, &product_name);
 
     // Keep track of device id and device name to see how often we receive
     // empty values.
     MediaStorageUtil::RecordDeviceInfoHistogram(false, device_id,
                                                 storage_label);
     if (device_id.empty() || storage_label.empty())
       return;
 
-    DCHECK(!ContainsKey(storage_map_, location));
+    DCHECK(!base::ContainsKey(storage_map_, location));
 
     StorageInfo storage_info(device_id, location, storage_label,
                              vendor_name, product_name, 0);
     storage_map_[location] = storage_info;
     notifications_->ProcessAttach(storage_info);
   } else {
     // Existing storage is detached.
     StorageLocationToInfoMap::iterator it =
         storage_map_.find(GetDeviceLocationFromStorageName(storage_name));
     if (it == storage_map_.end())
@@ skipping 19 matching lines @@
     if (it->second.device_id() == device_id) {
       *location = it->first;
       return true;
     }
   }
 
   return false;
 }
 
 }  // namespace storage_monitor