DevTools: Fix setting "Log XMLHttpRequests" in ConsoleView

BUG=
R=apavlov@chromium.org

Review URL: https://codereview.chromium.org/253993002

git-svn-id: svn://svn.chromium.org/blink/trunk@172866 bbb929c8-8fbe-4397-9dbb-9b2b20218538