[Layout] Fix some tests that fail when sync layout is removed from BrowserView

Synchronous layout during updating of devtools in BrowserView will
be removed in crrev.com/c/5398859. However, many tests fail even
though they are unrelated to devtools because they depend on layout
being called synchronously at some point when a new tab is added.
Since there are a lot of test failures, these CLs will be broken up.

Bug: 40234181
Change-Id: I2bd5d7e451d786ab481d081e7e48def03fb91e9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5407259


Commit-Queue: Elaine Chien <elainechien@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281952}