Security is happy with our communication model: https://chromium-review.googlesource.com/c/618799

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/49bbfa2c69b0e6f8e87c2ce234b09ec7fd1d3fa1

commit 49bbfa2c69b0e6f8e87c2ce234b09ec7fd1d3fa1
Author: Erik Chen <erikchen@chromium.org>
Date: Fri Aug 18 08:49:56 2017

Remove compile flag for out-of-process heap-profiling.

This feature is still gated behind a runtime flag "--memlog".

Bug:  753516 
Change-Id: I6a7e2aa3ba892531d38dbda8a0eb68a4e7cdea43
Reviewed-on: https://chromium-review.googlesource.com/619649
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#495505}
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