V8_USE_PERFETTO appears in used in the include directory so should be in
v8_header_features rather than features. Moving it means that all users
of the v8 headers will automatically get the define without having to
define it themselves.

Bug: chromium:1006541
Change-Id: I7eb67787fb42499d29c98a76a19a4ad8c04f7aa7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2621083
Commit-Queue: Dan Elphick <delphick@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Auto-Submit: Dan Elphick <delphick@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72004}