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A cached WebView's WebContents in WebUIBubbleManager may not
necessarily be in a visible state that enables processing of
rendering events.

Call WasShown() before reloading to ensure the WebContents propagates
these events and ShowUI() is eventually called.

Bug: None
Change-Id: I810b2e10e286e8cca1948ee6aab014efa843db86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530192Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826148}