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No one use it. Remove.

Bug: None
Change-Id: Id65c425b74149dc85658820d88192684f60e9c0d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1959787
Auto-Submit: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723483}