and replace it with forward declarations of all occuring classes.

R=tebbi@chromium.org

Bug: v8:7793
Change-Id: I337b069ef10d52e7e42332c977284b4d2ae8fafb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1609836Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61479}