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Fixes assert when trying to generate ninja build files for Windows Arm64 platform.

Bug: 1157842
Change-Id: I3e1858696696537bb96b36d3969f9f7f355faa28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584813
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: James Zern <jzern@google.com>
Cr-Commit-Position: refs/heads/master@{#836908}