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This reverts commit 74d2ba14.

Reason for revert:

This breaks the dialog.

The beforeunload dialog *must* block all of Chrome. MacViews does not have the modality code do to so yet. If you implement that modality you may reland this.

Original change's description:
> MacViews: Remove JavaScriptAppModalDialogCocoa
> 
> Move from using Cocoa to using Views. The Cocoa version was was causing
> problems with app exit dialogs showing up in the wrong process in
> RemoteMacViews. This issue was solved by the views version.
> 
> Bug: 898604
> Change-Id: I30bd1e543fa98a1503d80b4ad3947f676eb5e0c6
> Reviewed-on: https://chromium-review.googlesource.com/c/1298300
> Commit-Queue: ccameron <ccameron@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#605898}

TBR=ellyjones@chromium.org,ccameron@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 898604
Change-Id: I5ec60bc8490083175092da9b4f2d0a2167aac18a
Reviewed-on: https://chromium-review.googlesource.com/c/1331831Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607418}