Disable webrtc benchmark on benchmark smoke tests.

TBR=bpastene@chromium.org

Bug: 932036

Change-Id: Icb9ebd2b17560a843595d49cbee034f471ed8fa3
Reviewed-on: https://chromium-review.googlesource.com/c/1473831Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632334}

tools/perf/benchmarks/benchmark_smoke_unittest.py

@@ -118,6 +118,7 @@ _BLACK_LIST_TEST_NAMES = [
    'memory.long_running_idle_gmail_background_tbmv2',
    'tab_switching.typical_25',
    'oortonline_tbmv2',
+   'webrtc',  # crbug.com/932036
 ]