UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2816.0 Safari/537.36

Steps to reproduce the problem:
1. Hightlight text in chrome
2. Middle click somewhere you can type

What is the expected behavior?
Highlighted text is pasted.

What went wrong?
Highlighted text is not pasted; rather, whatever was previously highlighted (from another application) is pasted.

Did this work before? Yes A couple weeks ago.

Chrome version: 54.0.2816.0  Channel: n/a
OS Version: Ubuntu 14.04
Flash Version: Shockwave Flash 23.0 r0

Internal bug: http://b/31177222.