Ignore ThreatMatch responses for lists that we don't care about.

components/safe_browsing_db/v4_get_hash_protocol_manager.h

Index: components/safe_browsing_db/v4_get_hash_protocol_manager.h
diff --git a/components/safe_browsing_db/v4_get_hash_protocol_manager.h b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
index 83302c127625bf0f32f1ca1171f8a61667e09822..ffd4ea89056579c54b30114ea98269a010231af1 100644
--- a/components/safe_browsing_db/v4_get_hash_protocol_manager.h
+++ b/components/safe_browsing_db/v4_get_hash_protocol_manager.h
@@ -335,9 +335,9 @@ class V4GetHashProtocolManager : public net::URLFetcherDelegate,
   // The following sets represent the combination of lists that we would always
   // request from the server, irrespective of which list we found the hash
   // prefix match in.
-  std::unordered_set<PlatformType> platform_types_;
-  std::unordered_set<ThreatEntryType> threat_entry_types_;
-  std::unordered_set<ThreatType> threat_types_;
+  std::vector<PlatformType> platform_types_;
+  std::vector<ThreatEntryType> threat_entry_types_;
+  std::vector<ThreatType> threat_types_;
 
   DISALLOW_COPY_AND_ASSIGN(V4GetHashProtocolManager);
 };