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This is now a property of an instance rather than a delegate method.

This change introduces one minor behavior change: on Windows,
HungRendererDialogView used to use a custom frame when Aero Glass was
enabled; it will now use a custom frame when Aero Glass is enabled *or*
the dialog is parented. I think the old behavior was a bug - it is not
supported to use a custom frame with no parent window.

Some reworking of the DialogTest suite was required, because this suite
used to override ShouldUseCustomFrame to return true despite not having
a parent widget for the test dialogs. This change introduces a parent
widget so that these tests continue to get the custom frame they desire.

Bug: 1011446
Change-Id: Ib3a8521368e1d7d779c2346fc74c97633fd13f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846317Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704614}