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Widens modal dialogs from 320dp to 448dp, which is currently only
WindowNamePrompt.

Bug: 1106422
Change-Id: Id8db619b09bdb8cff8f6caaa3def215178558565
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453895
Auto-Submit: Peter Boström <pbos@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814388}