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Makes our implementation more similar to native dialogs on Windows, like the Run dialog.

R=dmazzoni@chromium.org, sadrul@chromium.org

Bug: 779297
Change-Id: Idde84c1664f4cc7af43b6470825ff4cdc3ddd475
Tested: Using Inspect tool from the Windows SDK
Reviewed-on: https://chromium-review.googlesource.com/902842Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536715}