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The switch to lld as linker means that is_win_fastlink is no longer
applicable, and manually selecting lld as the linker is no longer
necessary.

Change-Id: I9c4c815d2b8834223b98fa3de72ab937b910929f
Reviewed-on: https://chromium-review.googlesource.com/1101479Reviewed-by: Reid Kleckner <rnk@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567388}