[tools] Fix tryperf depot_tools updating

TBR=phajdan.jr@chromium.org
NOTRY=true

Change-Id: Ifaec5818beda86020f14b2be39821759a3ee058e
Reviewed-on: https://chromium-review.googlesource.com/506731Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45358}

tools/try_perf.py

@@ -91,7 +91,7 @@ def main():
 
   # Ensure depot_tools are updated.
   subprocess.check_output(
-      'gclient', shell=True, stderr=subprocess.STDOUT, cwd=V8_BASE)
+      'update_depot_tools', shell=True, stderr=subprocess.STDOUT, cwd=V8_BASE)
 
   cmd = ['git cl try -m internal.client.v8']
   cmd += ['-b %s' % bot for bot in options.bots]