Easy way to repro this is pulling up Gmail and looking at the links list. This is happening because the links are simply too long to fit on the screen. Let's add ... instead. 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/130aefc5b0d01ced8a2dc0b17db8179d422ac526

commit 130aefc5b0d01ced8a2dc0b17db8179d422ac526
Author: dmazzoni <dmazzoni@chromium.org>
Date: Wed Mar 22 23:22:42 2017

Set limit on maximum width of ChromeVox menus.

The auto-generated ChromeVox menus like the list of headings or links
often contain long strings or urls, which were causing the ChromeVox menus
to extend past the width of the screen. Fix this with some simple CSS that
sets a maximum width for the menu title, makes it stay on a single line and
not auto-wrap, and then uses ellipses to visually show if the whole title
doesn't fit.

BUG= 672941 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2760803002
Cr-Commit-Position: refs/heads/master@{#458926}

[modify] https://crrev.com/130aefc5b0d01ced8a2dc0b17db8179d422ac526/chrome/browser/resources/chromeos/chromevox/cvox2/background/panel.css
[modify] https://crrev.com/130aefc5b0d01ced8a2dc0b17db8179d422ac526/chrome/browser/resources/chromeos/chromevox/cvox2/background/panel_menu_item.js