[Sync] Ensure that CONFIGURE_CLEAN types get unapplied before configuration

components/sync/test/engine/test_syncable_utils.cc

Index: components/sync/test/engine/test_syncable_utils.cc
diff --git a/components/sync/test/engine/test_syncable_utils.cc b/components/sync/test/engine/test_syncable_utils.cc
index f3c6007ed0dab057fcc93b2c64dc1df6fb03633f..5761cd5da5b87deec51baae8fa96bf4cfb1121f6 100644
--- a/components/sync/test/engine/test_syncable_utils.cc
+++ b/components/sync/test/engine/test_syncable_utils.cc
@@ -66,6 +66,10 @@ Id GetOnlyEntryWithName(BaseTransaction* rtrans,
 void CreateTypeRoot(WriteTransaction* trans,
                     syncable::Directory* dir,
                     ModelType type) {
+  // Root node for this type shouldn't exist yet.
+  Entry same_type_root(trans, GET_TYPE_ROOT, type);
+  DCHECK(!same_type_root.good());
+
   std::string tag_name = ModelTypeToRootTag(type);
   syncable::MutableEntry node(trans, syncable::CREATE, type,
                               TestIdFactory::root(), tag_name);