DevTools: Restore scrolling in widgets

The behavior of `contain: layout` changed, and now it seems to prevent
scrollbars from appearing. See https://crbug.com/843320

A follow up patch will fix this for old frontends.

Bug: 851622
Change-Id: I91534d8b9f42d37766147ff31ce941916c8ed713
Reviewed-on: https://chromium-review.googlesource.com/1101404
Reviewed-by: Andrey Lushnikov <lushnikov@chromium.org>
Commit-Queue: Joel Einbinder <einbinder@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567885}
1 file changed