DevTools: ensure console links are always visible

- The %c style formatter will not apply to links in console
- Messages now have 'overflow: hidden'

Screenshot: https://imgur.com/a/7tAj9

Bug: 798096
Change-Id: Ifc31314cec2a286e58ebb5625348f8dfe2827d6e
Reviewed-on: https://chromium-review.googlesource.com/849650
Commit-Queue: Erik Luo <luoe@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527501}