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Calling GetPreferredSize() on a label which hadn't otherwise computed a layout
would return an empty size, which seems wrong.

Calling GetHeightForWidth() (a const method) could change the results of
GetPreferredSize(), a violation of logical constness.

Bug: none
Change-Id: I2729b9d83ffa94e368fb6553e9ead4b2646e01c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884360
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710622}