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This CL was initially generated by //tools/gn/roll_gn.py and
picks up the following changes:

https://gn.googlesource.com/gn/+log/e327ffdc..6f13aaac

    6f13aaac [visibility] Consider configs in visibility check
    5da62d5e Fix native MinGW build
    0649bd9a Add MSYS as a platform.
    501b49a3 clang: Add support for C++ modules in deps
    03df22eb [rust-project] Add "proc_macro" as dep for proc macro targets
    b489f906 Add support for Solaris and illumos systems

6f13aac is a breaking change, in that it addresses gn bug #22,
where `visibility` was not actually enforced on configs (it was
enforced only on targets); as a result, we have some visibility
violations that are now picked up with the new GN binary.

This CL fixes those violations.

Change-Id: I52b6e01f31ce64c1926e97b699b7f8a399dbf9f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360685
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800616}