Chromium change:

https://chromium.googlesource.com/chromium/src/+/108dc9210ea25e593ad8139763ee1e1665752f96

commit 108dc9210ea25e593ad8139763ee1e1665752f96
Author: Nico Weber <thakis@chromium.org>
Date:   Tue Feb 25 17:25:32 2020 +0000

    win: Remove is_win_fastlink arg.

    It only has an effect when not using clang and lld, and the default
    build setup is to use clang and lld. Also, goma has dropped support
    for non-clang compiles, and a main use case for is_win_fastlink
    was being able to use goma. Finally, is_win_fastlink never worked
    well.

    Bug: 1053958