Add a whitespace change to force the test to no longer dedupe

This is to fix the issue mentioned in crbug.com/993363

NOTRY=true
TBR=jbudorick

Bug: 993363
Change-Id: I58f3cd8ebc0761124d51be5328852a493b487eea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1751906
Commit-Queue: Haiyang Pan <hypan@google.com>
Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Auto-Submit: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#686476}

testing/test_env.py

@@ -284,6 +284,7 @@ def forward_signals(procs):
     signal.signal(signal.SIGTERM, _sig_handler)
     signal.signal(signal.SIGINT, _sig_handler)
 
+
 def run_executable(cmd, env, stdoutfile=None):
   """Runs an executable with:
     - CHROME_HEADLESS set to indicate that the test is running on a