Some debugging tests relied on the following anti-pattern:

 let exception = false;

 try {
   /* ... some code that may throw on test failure ... */
 } catch (e) {
   exception = e;
 }

 assertFalse(exception);

This may be problematic if a falseish value is thrown.

Change-Id: I02eace4cc656fc9581928a90ac53cda4dc72b30c
Reviewed-on: https://chromium-review.googlesource.com/972822Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52105}