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. Use mouse to select some text in the web view under X11. This fills the primary selection buffer. Do not copy into clipboard buffer.
2. Attempt to paste from primary selection buffer using middle click into a textbox in Chrome, or another compliant X11 program (e.g. gnome-terminal, gedit).

(Observe, this applies to text generally present in the web view -- such as text directly inside a <div>, <span> etc. It does not apply to textboxes, input fields, or to the surrounding chrome such as the addressbar.)

What is the expected behavior?
The primary selection buffer has been updated, and the text selected in Chrome's web view is middle-click-pasted into the destination program.

What went wrong?
Whatever value was in the primary selection buffer remains there. The text selected in the web view does not get pasted; instead the old value gets pasted into the destination program's UI.

Did this work before? Yes Version 53.0.2785.92 (64-bit)

Chrome version: 54.0.2816.0  Channel: beta
OS Version: Ubuntu 14.04.x (g)
Flash Version: Shockwave Flash 23.0 r0