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Reuse the WTF macro in platform/heap/ to avoid maintaining two macros.

Bug: chromium:1056170
Change-Id: I3c3867c798ff76eeed72050674c6709a39d5f018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533776
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827195}