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NativeViewHost has code to deal with being clipped by an ancestor. This logic
dates back to when we used NativeViewHost more often, and in particular when
NativeViewHost was contained in a ScrollView. AFAIK we no longer have this
scenario, so, this removes the unnecessary logic.

BUG=none
TEST=covered by tests

Change-Id: I7b1a9ba047bd7c4abab68f9fe49c651bf50209d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1560130
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#649355}