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We had a global define NO_TCMALLOC, and then build/build_config.h
set a define USE_TCMALLOC if that wasn't set.

Instead, use the buildflag system.

Also remove most allocator gn args from build/config/allocator.gni
to base/allocator/allocator.gni (the rest to move in a follow-up).

Also use a single, consistent mechanism for disabling allocator args
for nacl.

No behavior change.

Bug: 961767
Change-Id: Id2776cee1c77c00f401b73c414bb5e8d924ce4d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1731613
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683347}