xdai@: Did the dialog spec change again?

I was not aware of it. Seems like a regression. I'll take a look.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/569e9b21b96de18a0f92611999de8eacc9d110d4

commit 569e9b21b96de18a0f92611999de8eacc9d110d4
Author: xdai <xdai@chromium.org>
Date: Mon Jan 22 20:30:02 2018

CUPS: Fix the height of the manufacturer-model drop-down list.

Otherwise the last item might be cut by the dialog.

Bug:  793338 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If1ac9576a2cac4c7d3c5c1d3820098319f9aef29
Reviewed-on: https://chromium-review.googlesource.com/875207
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530974}
[modify] https://crrev.com/569e9b21b96de18a0f92611999de8eacc9d110d4/chrome/browser/resources/settings/printing_page/cups_add_printer_dialog_util.html