Summary: Closes https://github.com/facebook/draft-js/pull/225

Differential Revision: D3085667

fb-gh-sync-id: 8b0b4d605f5fbeffd7a4e9e87abd70957a59aa7b
shipit-source-id: 8b0b4d605f5fbeffd7a4e9e87abd70957a59aa7b