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This patch updates the back button visibility for Assistant web
container.

Bug: b/141268413
Test: manual
Change-Id: I2dfd3209e4954e04295340d48f05516bde37d09a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873147
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712852}