[USS] implement CreateMetadataChangeList and GetClientTag

components/history/core/browser/typed_url_sync_metadata_database.cc

Index: components/history/core/browser/typed_url_sync_metadata_database.cc
diff --git a/components/history/core/browser/typed_url_sync_metadata_database.cc b/components/history/core/browser/typed_url_sync_metadata_database.cc
index f0b2ce6ddf35795ceef3f0449fdbe316c368f44b..6cc6d15774694b330dfcdc653bd0cdb7e459caa4 100644
--- a/components/history/core/browser/typed_url_sync_metadata_database.cc
+++ b/components/history/core/browser/typed_url_sync_metadata_database.cc
@@ -48,12 +48,8 @@ bool TypedURLSyncMetadataDatabase::GetAllSyncMetadata(
 }
 
 bool TypedURLSyncMetadataDatabase::UpdateSyncMetadata(
-    syncer::ModelType model_type,
     const std::string& storage_key,
     const sync_pb::EntityMetadata& metadata) {
-  DCHECK_EQ(model_type, syncer::TYPED_URLS)
-      << "Only the TYPED_URLS model type is supported";
-
   int64_t storage_key_int = 0;
   if (!base::StringToInt64(storage_key, &storage_key_int)) {
     return false;
@@ -68,11 +64,7 @@ bool TypedURLSyncMetadataDatabase::UpdateSyncMetadata(
 }
 
 bool TypedURLSyncMetadataDatabase::ClearSyncMetadata(
-    syncer::ModelType model_type,
     const std::string& storage_key) {
-  DCHECK_EQ(model_type, syncer::TYPED_URLS)
-      << "Only the TYPED_URLS model type is supported";
-
   int64_t storage_key_int = 0;
   if (!base::StringToInt64(storage_key, &storage_key_int)) {
     return false;
@@ -85,20 +77,14 @@ bool TypedURLSyncMetadataDatabase::ClearSyncMetadata(
 }
 
 bool TypedURLSyncMetadataDatabase::UpdateModelTypeState(
-    syncer::ModelType model_type,
     const sync_pb::ModelTypeState& model_type_state) {
-  DCHECK_EQ(model_type, syncer::TYPED_URLS)
-      << "Only the TYPED_URLS model type is supported";
   DCHECK_GT(GetMetaTable().GetVersionNumber(), 0);
 
   std::string serialized_state = model_type_state.SerializeAsString();
   return GetMetaTable().SetValue(kTypedURLModelTypeStateKey, serialized_state);
 }
 
-bool TypedURLSyncMetadataDatabase::ClearModelTypeState(
-    syncer::ModelType model_type) {
-  DCHECK_EQ(model_type, syncer::TYPED_URLS)
-      << "Only the TYPED_URLS model type is supported";
+bool TypedURLSyncMetadataDatabase::ClearModelTypeState() {
   DCHECK_GT(GetMetaTable().GetVersionNumber(), 0);
   return GetMetaTable().DeleteKey(kTypedURLModelTypeStateKey);
 }