[CodeHealth] Reduces GN checks error for //headless/*

This change is part of a code health effort to enable gn check for all
directories:
https://docs.google.com/document/d/1sGxV0nGGoavOuw6XodYQ9xiN1f8fIhrb32gwADr2cD4/

I think the most of rest of errors are from the dependencies of
headless_shared_sources over headless_no_renderer and
headless_renderer, which might require some refactoring. I am not the
most suitable person as the lack of the domain knowledge of
//headless/*.

Bug: 1349362
Change-Id: Id4ef24fd0ef44bd2f3edc4c9690cf222d637dcd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3806001
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: William Liu <liuwilliam@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1032740}