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After this change, ShellView is only responsible for being the contents
view of the content shell, and not also for doubling as the window's
delegate. Instead, a separate delegate (of the stock WidgetDelegate
class) is constructed and installed.

Bug: 1075649
Change-Id: I3bc18b53d3c660da21571ca969541699d524af3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2461591Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815628}