Each DatabaseManager gets to decide which stores to track

components/safe_browsing_db/v4_protocol_manager_util.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_SAFE_BROWSING_DB_V4_PROTOCOL_MANAGER_UTIL_H_
 #define COMPONENTS_SAFE_BROWSING_DB_V4_PROTOCOL_MANAGER_UTIL_H_
 
 // A class that implements the stateless methods used by the GetHashUpdate and
 // GetFullHash stubby calls made by Chrome using the SafeBrowsing V4 protocol.
 
@@ skipping 189 matching lines @@
   // request, and the error code, when there is.
   // |metric_name| is the name of the UMA metric to record the response code or
   // error code against, |status| represents the status of the HTTP request, and
   // |response code| represents the HTTP response code received from the server.
   static void RecordHttpResponseOrErrorCode(const char* metric_name,
                                             const net::URLRequestStatus& status,
                                             int response_code);
 
   // Generate the set of FullHashes to check for |url|.
   static void UrlToFullHashes(const GURL& url,
-                              base::hash_set<FullHash>* full_hashes);
+                              std::unordered_set<FullHash>* full_hashes);
 
   static bool FullHashToHashPrefix(const FullHash& full_hash,
                                    PrefixSize prefix_size,
                                    HashPrefix* hash_prefix);
 
   static bool FullHashToSmallestHashPrefix(const FullHash& full_hash,
                                            HashPrefix* hash_prefix);
 
   static bool FullHashMatchesHashPrefix(const FullHash& full_hash,
                                         const HashPrefix& hash_prefix);
@@ skipping 58 matching lines @@
 
 template <>
 struct hash<safe_browsing::UpdateListIdentifier> {
   std::size_t operator()(const safe_browsing::UpdateListIdentifier& id) const {
     return id.hash();
   }
 };
 }
 
 #endif  // COMPONENTS_SAFE_BROWSING_DB_V4_PROTOCOL_MANAGER_UTIL_H_