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This clears the visibility of search results and assistant, while
the visibility of horizontal page container (i.e. apps grid)
remains. I thought SetActiveState() will update that, but actually
it does nothing if the target page is not visible. As the result,
this can cause nothing to be shown in the app-list.

BUG=b/142069648
TEST=manually, app_list_unittests

Change-Id: I6e50b7e1b2f2234bd347ac5b7fdef35ecbe8522d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838303Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702647}