Re-write many calls to WrapUnique() with MakeUnique()

components/drive/resource_metadata_storage.cc

Index: components/drive/resource_metadata_storage.cc
diff --git a/components/drive/resource_metadata_storage.cc b/components/drive/resource_metadata_storage.cc
index 704f47e16047bbf0c42ce1026fcfcfcb9792d6f9..8a0eb35bef7530689e1f077f321e57c3c44ffc43 100644
--- a/components/drive/resource_metadata_storage.cc
+++ b/components/drive/resource_metadata_storage.cc
@@ -826,7 +826,7 @@ ResourceMetadataStorage::GetIterator() {
 
   std::unique_ptr<leveldb::Iterator> it(
       resource_map_->NewIterator(leveldb::ReadOptions()));
-  return base::WrapUnique(new Iterator(std::move(it)));
+  return base::MakeUnique<Iterator>(std::move(it));
 }
 
 FileError ResourceMetadataStorage::GetChild(const std::string& parent_id,