DevTools: unflake http/tests/inspector/command-line-api-inspect.html.

BUG=282085
TBR=vsevik

Review URL: https://chromiumcodereview.appspot.com/23597012

git-svn-id: svn://svn.chromium.org/blink/trunk@156982 bbb929c8-8fbe-4397-9dbb-9b2b20218538