GoogleChrome/chrome-app-samples — pull request #318 by beaufortfrancois (2014-09-09 11:32:44+00:00)
Title: Removed screenshots thumbnails

Since we don't use screenshots thumbnails anymore, I think it would be better to remove them to clean the repo and also reduce the zipball size.

For info, I simply ran `git ls-files | grep screenshot_thumbnail.png | xargs git rm`

TBR=@mangini