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Previously TrayDetailedView directly depended on SystemTrayItem. It did
not work with UnifiedSystemTray.

In this CL, bubble related actions from TrayDetailedView will be
delegated to DetailedViewDelegate.
This CL also includes SystemTrayDetailedViewDelegate, which implements
the default behavior for old SystemTray.

In upcoming CLs DetailedViewDelegate implementation for
UnifiedSystemTray will be added.

Design doc: go/cros-qs-restyling (See "detailed view" section)

TEST=ash_unittests
BUG=835733

Change-Id: I54074335f982ab4e1d07abdb88c5347e6c1d7ff1
Reviewed-on: https://chromium-review.googlesource.com/1068560Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561713}