Random test failure in Drupal\views_ui\Tests\DisplayPathTest

Problem/Motivation

-- [[SimpleTest]]: [PHP 5.4 MySQL] --

* Drupal\views_ui\Tests\DisplayPathTest (97 pass(es), 2 fail(s), and 0 exception(s))
   - [fail] [Fatal error] "[09-Oct-2014 12:26:18 UTC] Uncaught PHP Exception InvalidArgumentException: "The URI "base://(:;2&+h^" is invalid. You must use a valid URI scheme. Use base:// for a path, e.g., to a Drupal file that needs the base path. Do not use this for internal paths controlled by Drupal." at /var/lib/drupaltestbot/sites/default/files/checkout/core/lib/Drupal/Core/Url.php line 207
" in Unknown on line 0 of Unknown.
   - [fail] [Fatal error] "[09-Oct-2014 12:26:18 UTC] Uncaught PHP Exception InvalidArgumentException: "The URI "base://(:;2&+h^" is invalid. You must use a valid URI scheme. Use base:// for a path, e.g., to a Drupal file that needs the base path. Do not use this for internal paths controlled by Drupal." at /var/lib/drupaltestbot/sites/default/files/checkout/core/lib/Drupal/Core/Url.php line 207
" in Unknown on line 0 of Unknown.

Proposed resolution

I'm guessing this was introduced in #2347465: Convert all instances of #type link/links to convert to use routes and would need the workaround there applied to an outstanding randomString() call elsewhere in the test.

Remaining tasks

Confirm the random failure in HEAD and that this resolves it. (Currently running the test locally but it's slow.)

User interface changes

N/A

API changes

N/A