Fix a re-layout issue when entering and exiting split view

We now have extra re-layout happening to the web contents when entering
and exiting split view. This is because of inconsistencies between
layout passes that happens during tab switch. A future CL will look at
eliminating these extra layout passes.

Change-Id: Ie739541b0f151fa5fa155a2af7b365bd0b69665e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6589093
Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Eshwar Stalin <estalin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1466551}