IWYU: usage of uint64_t requires include in visit_delegate.h

Bug: 41455655
Change-Id: Ibfc370d68645ad1f2343baa4268754d861235494
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5410231


Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Commit-Queue: José Dapena Paz <jdapena@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1280784}