Followup from https://codereview.chromium.org/672513002/ to fix checklicenses again.

TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/664773004

Cr-Commit-Position: refs/heads/master@{#300634}

tools/checklicenses/checklicenses.py

@@ -400,6 +400,7 @@ PATH_SPECIFIC_WHITELISTED_LICENSES = {
     ],
     # Not shipped, downloaded on trybots sometimes.
     'tools/telemetry/third_party/gsutil': [
+        'BSD MIT/X11 (BSD like)',
         'UNKNOWN',
     ],
     'tools/telemetry/third_party/pyserial': [