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The sheet is currently being drawn on a transparent overlay when using
remote Cocoa (e.g. PWA windows), which results in a number of UI issues.
This was exacerbated by
https://chromium-review.googlesource.com/c/chromium/src/+/2324112.

Instead, add a ShowCertificateViewer() Mojo call and move the
implementation to NativeWidgetNSWindowBridge. Along the way, simplify
the implementation. We can now largely rely on Cocoa's built-in lifetime
management for the SFCertificatePanel.

Bug: 916815, 1130490
Change-Id: Ia33102417510d7c0fc6fb09cf55d9fa61efdfdff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2421633Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809861}