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As per discussion with ssid@, 64-bit browser builds should not have a
32-bit unwind asset in them.

R=estevenson

Bug: 1038962
Change-Id: I012138cff1071d74f2722277a90758d44bf8677b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1993676
Auto-Submit: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729978}