Do not set include_dirs in direct_dependent_settings.
Do not set include_dirs in direct_dependent_settings.

This is unintuitive, and can silently override system headers if there
name collisions between headers in sandbox/win/src and system headers.

BUG=

Review URL: https://codereview.chromium.org/1423223003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#356681}

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