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The overlay scrollbar ThumbPosition method was losing precision at very
high scroll offsets. This would cause it to drift away from where we
actually show the thumb from the compositor so the hit testing would be
unreliable.

Looking at this method, there's no reason it should need to be any
different from the base class ScrollbarTheme::ThumbPosition which is
robust under high scroll offsets so the solution here is to simply
remove the override. Less code, less bugs.

Bug: 739668
Change-Id: Ib90152d989931cd0bcc0bddfb226d97d577ce575
Reviewed-on: https://chromium-review.googlesource.com/598734Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491766}