[iOS] Have default behavior for StatusBar in TableView

This CL removes the specific behavior for showing/hiding the Status Bar
in the ChromeTableView based on the MDCAppBar (when enabled).
It uses the default behavior instead.

Bug: 912047
Change-Id: I62d983482d8c3431ac772c6e88ba04c32ccee584
Reviewed-on: https://chromium-review.googlesource.com/c/1365445
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614644}