Make FindBuffer::FindMatches use blink::FindOptions

Previously FindBuffer uses mojo's FindOptions that doesn't have as many
options as blink::FindOptions. Instead of changing the mojo struct we
resort back to use blink::FindOptions because the options we want to add
are already there and are not related to browser-renderer IPCs.

Bug: 868227
Change-Id: I4371abbbf6b729e653eddfe68f9fd0023b1c01d1
Reviewed-on: https://chromium-review.googlesource.com/c/1446253
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#627867}
4 files changed