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Note that there are 3 app dialogs here generated by the same code:
one for uninstalling, one for USB list permission, and one for USB
access permission.

As per crbug.com/788010 Comment 1 (and previous dlgs):
- Allow text to run to right edge of dialog (minus margin)
- Remove X (Close) button from upper right
- Width = 448px

Bug: 788010
Test: Try to uninstall an ARC++ app, or use one to access USB devices.
OMG Harmony!

Change-Id: I6ffe099ba9f4fe3fae7cd3b6f203873000dd62e8
Reviewed-on: https://chromium-review.googlesource.com/1066450
Commit-Queue: Greg Levin <glevin@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565339}