Screenshots for CL https://codereview.chromium.org/2630243003.
[Harmony Download recovery dialog on MacViews]

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Also, to summon this dialog: Go to testsafebrowsing.appspot.com. Download from any of the links listed under "Desktop Download Warnings". Go to chrome://downloads and click on "Keep Dangerous File" corresponding to the download.

Per shrike, unassigning his Harmony bugs for now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5fba2166ddb709508371545bdb88a9c87929615d

commit 5fba2166ddb709508371545bdb88a9c87929615d
Author: karandeepb <karandeepb@chromium.org>
Date: Wed Jan 25 11:07:44 2017

MacViews: Enable views based Download Recovery dialog behind secondary-ui-md flag.

This CL puts the views based Download Recovery dialog behind the secondary-ui-md
flag. As a result, the views based version is shown with the flag "secondary-ui-
md" enabled and the Cocoa version is shown without it.

This CL also does some clean-up in download_danger_prompt_browsertest.cc and
parameterizes the test fixture to test it both with and without the secondary-
ui-md flag.

BUG= 662128 , 654142

Review-Url: https://codereview.chromium.org/2630243003
Cr-Commit-Position: refs/heads/master@{#445995}

[modify] https://crrev.com/5fba2166ddb709508371545bdb88a9c87929615d/chrome/browser/download/download_danger_prompt.h
[modify] https://crrev.com/5fba2166ddb709508371545bdb88a9c87929615d/chrome/browser/download/download_danger_prompt_browsertest.cc
[modify] https://crrev.com/5fba2166ddb709508371545bdb88a9c87929615d/chrome/browser/ui/BUILD.gn
[modify] https://crrev.com/5fba2166ddb709508371545bdb88a9c87929615d/chrome/browser/ui/cocoa/download/download_danger_prompt_impl.cc
[modify] https://crrev.com/5fba2166ddb709508371545bdb88a9c87929615d/chrome/browser/ui/views/download/download_danger_prompt_views.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eded5d090fe927b25447961e6d61df9859c36531

commit eded5d090fe927b25447961e6d61df9859c36531
Author: Peter Boström <pbos@chromium.org>
Date: Mon Oct 30 22:57:41 2017

Add interactive tests for DownloadDangerPrompt.

Exposes all current window titles, message bodies and cancel-button
text.

Also fixing crash when DownloadDangerPromptViews is destructed without
triggering an action. This happens at least when browser_tests are run
without --interactive, though possibly also when a tab gets closed
without closing the dialog first.

Bug: chromium:654142
Change-Id: I7339ffec27cb41d50ddc97aece2ca4fdf403cbb5
Reviewed-on: https://chromium-review.googlesource.com/731617
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512660}
[modify] https://crrev.com/eded5d090fe927b25447961e6d61df9859c36531/chrome/browser/download/download_danger_prompt_browsertest.cc
[modify] https://crrev.com/eded5d090fe927b25447961e6d61df9859c36531/chrome/browser/ui/cocoa/download/download_danger_prompt_impl.cc
[modify] https://crrev.com/eded5d090fe927b25447961e6d61df9859c36531/chrome/browser/ui/views/download/download_danger_prompt_views.cc

The NextAction date has arrived: 2017-11-10

Load balancing

"ok" and Cancel buttons are backward, here. Suspect it's intentional, but doesn't look right, especially since the default button is marked cancel.

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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/798e8038bec1f5923134ac43fda5e30a17d7f431

commit 798e8038bec1f5923134ac43fda5e30a17d7f431
Author: Allen Bauer <kylixrd@chromium.org>
Date: Fri Feb 02 23:34:40 2018

Make sure the dangerous download dialog is 320px wide.

Bug: 654142
Change-Id: I0bd9cd4fcf4337b20809a99329e429f62f14994f
Reviewed-on: https://chromium-review.googlesource.com/896165
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534195}
[modify] https://crrev.com/798e8038bec1f5923134ac43fda5e30a17d7f431/chrome/browser/ui/views/download/download_danger_prompt_views.cc

Here's the dialog now forced to 320px.

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Reassigned for UX review

Dialog needs to be 448. Otherwise, LGTM