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This enables deletion of the telemetry_perf_tests isolate and the recipe
code that supports it.

Bug: 757933
Change-Id: I82198ff98e3d7dc189761f1468bc88b591f2a5b1
Reviewed-on: https://chromium-review.googlesource.com/1129364Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Emily Hanley <eyaich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573456}