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The [1] CL again changed the opt-in interface for declarative
Shadow DOM, and I forgot to update the perf test. This CL makes
that update. I wish there were perf bots in the CQ.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2530222

Bug: 1042130
Fixed: 1148583
Change-Id: Icee204fd4fecc2926dbe50ab7c08b36643d11c4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536451Reviewed-by: Joey Arhar <jarhar@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827188}