[Sync] Prepend global metadata key with model type prefix

components/sync/model/model_type_store.cc

Index: components/sync/model/model_type_store.cc
diff --git a/components/sync/model/model_type_store.cc b/components/sync/model/model_type_store.cc
index ba9969ee44c546e8818adc23a77e5f0ee7c428ef..b9b09334fcf07407c786145f932f8737f84ec3cf 100644
--- a/components/sync/model/model_type_store.cc
+++ b/components/sync/model/model_type_store.cc
@@ -9,13 +9,14 @@
 namespace syncer {
 
 // static
-void ModelTypeStore::CreateInMemoryStoreForTest(const InitCallback& callback) {
-  ModelTypeStoreImpl::CreateInMemoryStoreForTest(callback);
+void ModelTypeStore::CreateInMemoryStoreForTest(ModelType type,
+                                                const InitCallback& callback) {
+  ModelTypeStoreImpl::CreateInMemoryStoreForTest(type, callback);
 }
 
 // static
 void ModelTypeStore::CreateStore(
-    const ModelType type,
+    ModelType type,
     const std::string& path,
     scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
     const InitCallback& callback) {