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The ActiveMatch may be null when make a FindRequest with options that kWrapAround is
false, while the active_rect in |FindRequestManager| will not update when it is
empty then we will show a incorrect tickmark(active_rect of last FindRequest)
on Android. so We should reset the active_rect in |FindRequestManager| when there
is a new FindRequest.

Bug: 1141374

Change-Id: Ieac210a2b72f4f92649e68e1b2e2969fd707dbf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491726Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825424}