Fix <select> popup width

Fix typo in calculation of AnchoredPopupWindow's width.

Bug: 862594
Change-Id: I0f79ca75c1d3c003d24dcba835fb6925b8d1dab5
Reviewed-on: https://chromium-review.googlesource.com/1136723
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Amirhossein Simjour <asimjour@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574999}
1 file changed