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The :focus-within pseudo-class shipped in Chrome 60.

The runtime flag is no longer needed.

BUG=617371

Change-Id: I12db298d40df458c24987e7928d85aea179e6046
Reviewed-on: https://chromium-review.googlesource.com/662984Reviewed-by: Manuel Rego Casasnovas <rego@igalia.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501599}