[Blink/WTF] Fix operator new usage

Fix operator new resolution failures in:
- third_party/blink/renderer/platform/wtf/construct_traits.h
- third_party/blink/renderer/platform/wtf/thread_specific.h

They intend to call the global operator defined in
third_party/blink/renderer/platform/wtf/allocator/allocator.h

But the operator resolution may fail if |T| has user-defined operator
new().

https://godbolt.org/z/zxnYEj4We

Change-Id: Id97a570e098404348e7a50fcdfba459229a71eef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4727836
Auto-Submit: Mikihito Matsuura <mikt@google.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1176551}