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Running with --test-path seems to no longer be supported. This CL updates the
documentation to use story-filter.

Change-Id: I9e202ef4a4b8474acbf1d8af4f81d44c1ffaf85a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1946429
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720638}