Remove current layout engine's unbreakable images quirk.

This removes the unbreakable images quirk (where there is no break
opportunity between an image and a word), during the layout phase of
the current layout system.

This does not remove the quirk from the min/max contribution phase, as
this seems necessary for the web-compat.

This now matches FF, Edge, and LayoutNG behaviour.

Bug: 635619
Change-Id: I6de59a67a75a0040d4388e2808637c074a71aa25
Reviewed-on: https://chromium-review.googlesource.com/c/1394726
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Reviewed-by: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#620052}
10 files changed