Fix the description argument in run-blink-websocketserver

Bug: 692926
Change-Id: Iacd04725bfbc2f0beff5bd87b9061d4ba369d6e2
Reviewed-on: https://chromium-review.googlesource.com/807864Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Takeshi Yoshino <tyoshino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522348}

third_party/WebKit/Tools/Scripts/run-blink-websocketserver

@@ -43,4 +43,4 @@ import webkitpy.common.version_check
 from webkitpy.layout_tests.servers import cli_wrapper
 from webkitpy.layout_tests.servers import pywebsocket
 
-cli_wrapper.main(pywebsocket.PyWebSocket, description)
+cli_wrapper.main(pywebsocket.PyWebSocket, description=__doc__)