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This fixes the exception:

  File "/b/s/w/ir/testing/scripts/run_telemetry_benchmark_as_googletest.py", line 176, in run_benchmark
    if rc == 0:
UnboundLocalError: local variable 'rc' referenced before assignment

TBR=nednguyen

Bug: 891332
Change-Id: I81b8502f8f95bf8db070d8ccc062a343b062e880
Reviewed-on: https://chromium-review.googlesource.com/c/1258978
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596316}