[DevTools] Missing include

BUG=

Review-Url: https://codereview.chromium.org/2203623005
Cr-Original-Commit-Position: refs/heads/master@{#409362}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 340778c6826a65a0e87d533a61b5a349ac154359
1 file changed