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This CL was created (mostly) automatically with tools/perf/update_wpr script

This updates the youtube 2019 story, which is necessary because the 2018
recorded story makes use of Polymer 1 and the deprecated (and soon to be
removed) Web Components v0 features. This recording should not contain uses
of those features, *except* for HTML Imports. That will likely require
another re-record later.

Bug: 911943
Change-Id: I1905308e0448ec85d6a581e7bccd72fe86b3bddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872157
Commit-Queue: Mason Freed <masonfreed@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709664}