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A lot of subclasses of TableViewItem has "accessoryType" property.
Since accessoryType is a builtin property of UITableViewCell, we can
add it to TableViewItem itself and removes those from subclasses.

Change-Id: I22b1fff6a9ef8d2387c877982e299e4c9358b0f7
Reviewed-on: https://chromium-review.googlesource.com/c/1386848Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618491}