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When a page is navigated away, every RenderFrameHostImpl are properly
removed from find-in-page thanks to:
https://chromium-review.googlesource.com/c/chromium/src/+/1254262

However, the problem is that a removed frame does not automatically
remove its highlighted selections when it is removed.
This patch clear the highlighted selection.

If this CL is not applied, when users will go back to the page using the
back-forward cache. They will continue to see the yellow highlight.

Bug=1001087

Change-Id: Ied5d152d34210d66dfa9afc66b4b775f7cd82bc1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841631
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706547}