Allow direct access to final properties of BaseSuggestionProcessor.

This change aims at removing the need for accessors.

No logic was changed.

Change-Id: I0a45052b773733dec7ab785f884a6c2e8b8cee9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4523586


Auto-Submit: Tomasz Wiszkowski <ender@google.com>
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1147549}