"Fix" cloning from firebase to in-memory-storage by awaiting local modification flushing. (#2021)
"Fix" cloning from firebase to in-memory-storage by awaiting local modification flushing. (#2021)

* "Fix" cloning from firebase to in-memory-storage by awaiting local
modification flushing.

* Update in-memory-storage.ts

PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs