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Looks like kEmbeddedWindowEnsureNotInRect was introduced for mus and has
been cleaned up partially. Clean up the remaining part.

Bug: None
Change-Id: I390338677625c8b12aa8d0016a8d32e40acb456b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600326
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841731}