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The arm-nacl-clang toolchain is not currently uploaded to Goma RBE.
Instead of adding it (NaCl is deprecated), just use ATS to pass in
the compiler as an input file.

Bug: 950413
Change-Id: I482f8661cf1e1f54468f40cbf6692f48d3d591ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635116Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Simon Que <sque@chromium.org>
Auto-Submit: Simon Que <sque@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665030}