- cppgc_headers: Do not depend on any internals but merely expose the
  public API interface.
- v8_libbase: Do not depend on v8_headers but merely on
  v8_config_headers as src/base should be independent of general V8.

Bug: chromium:1056170
Change-Id: I06d1a4ea20f243bae8e994deba9d76f07993ed4a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2720303Reviewed-by: Dan Elphick <delphick@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73060}