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* It has circular dependencies with platform:platform,
  platform/instrumentation:instrumentation, and
  platform/scheduler:scheduler. This CL updates
  |allow_circular_includes_from|s for them.

* Change visibility of platform:platform_export to be used by
  platform/heap:heap_unsanitized.

This CL has no behavior changes.

Bug: 800764
Change-Id: Iba08daca769d5c41f20fd678ef2d3cbc3c72e3ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400782Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805619}