[ios] Add methods to FindInPageManager::FindRequest

This removes direct access to FindRequest's internal state.
A followup commit will be done to move FindRequest to a separate
class and make data members private.

Change-Id: I22fd5dbd06ee14a7aa990f031beafc67fce0aaa5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1613971
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663366}
2 files changed