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Instead just forward to the Trace method of this visitor which will call
ListHashSetNode::Trace after marking the node.

Bug: chromium:802273
Change-Id: Ic13090edead2e26c94ce0f0157e3d3f6d1effcb3
Reviewed-on: https://chromium-review.googlesource.com/939823
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539786}