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After the recent cleanup of crrev.com/2907563002, the flag
ENABLE_MEMORY_TASK_PROFILER became redundant and now is just
matching 1:1 USE_ALLOCATOR_SHIM. Use that instead.
No intended behavior change.
Also fix mistake of using defined(X) instead
of BUILDFLAG(X).

BUG=550886

Change-Id: I03a840b22861182208f1297a0c3f1152fd985c32
Reviewed-on: https://chromium-review.googlesource.com/520768
Commit-Queue: Primiano Tucci <primiano@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476364}