Quoting @Support (Twitter's official support account) from yesterday,

The "Delete Tweet" button is now in the “••• More” menu on http://Twitter.com .

Here's a screenshot of how it looks for me:

Quoting @Support (Twitter's official support account) from yesterday,

The "Delete Tweet" button is now in the “••• More” menu on http://Twitter.com .

Here's a screenshot of what it looks like for me: