DevTools: Build fix for win bot after r158180.

BUG=none
TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/24359004

git-svn-id: svn://svn.chromium.org/blink/trunk@158182 bbb929c8-8fbe-4397-9dbb-9b2b20218538