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Fortunately, all of the stories whosed names need to be trim down belong to
one off telemetry script (profile_generator) or Cluster Telemetry. Hence this
CL does not affect any benchmark's story name in production.

BUG=chromium:662941

Review-Url: https://codereview.chromium.org/2629413002
Cr-Commit-Position: refs/heads/master@{#443585}