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This Cl cleans up a TODO to remove an extra Layout call in Invalidate.
The extra call was a workaround for shifting text. I've identified some
unnecessary calls to SizeToPreferredSize() that was shifting the text.

This change should not cause any user visual changes.

This change may improve time to paint metrics.

Bug: None
Change-Id: I253b28e32c02d744a1e3d3c58b2522c04eefb323
Reviewed-on: https://chromium-review.googlesource.com/1041151Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555819}