UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36

Steps to reproduce the problem:
1. Visit "https://www.tarsnap.com/efficiency.html".
2. Select "https://www.tarsnap.com/" in the Omnibox.
3. Copy.
4. Paste into a text editor.
5. Observe that the entire contents of the Omnibox, rather than just the selection, was copied.

What is the expected behavior?
Only the selected text should be copied.

What went wrong?
The entire contents of the Omnibox are copied.

Did this work before? N/A 

Chrome version: 66.0.3359.181  Channel: stable
OS Version: OS X 10.10.5
Flash Version: