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As commented in the code, page_view->RequestFocus() might cause
ResetForShow(), which hides the embedded asssitant view, thus
the assistant UI might go invisible in a weird situation.

I hope I could find a holistic solution of controlling states
within ContentsView, but so far this would be the simplest fix
for the problem.

Bug: b/140831868
Test: manually
Change-Id: I9e1b551c2db448ff40c9f978130ce2a0225a4ebb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803958
Commit-Queue: Jun Mukai <mukai@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696597}