Convert SafeBrowsingUrlChecker to new Mojo types

This CL converts SafeBrowsingUrlCheckerPtr and
SafeBrowsingUrlCheckerRequest to new Mojo types.

It uses Remote and PendingReceiver instead of
SafeBrowsingUrlCheckerPtr and
SafeBrowsingUrlCheckerRequest.

Bug: 955171
Change-Id: I093c8e2bc641ba7cb11c1ebcd0ca39a23bc021ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1810514
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Nathan Parker <nparker@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#698328}