Drag and Drop did not work in Chrome 19.0.1084.46 m

Attach a file to a page using Drag and Drop feature no longer works in Chrome 19.0.1084.46 m. It used to work in Chrome 18.0.1025.168 m.

Steps to reproduce:

1. Go to a Confluence page
2. Click Add > Attachment
3. Drag and drop image/file here:
   
4. Outcome: Nothing happened