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Transitioned NewLinkedHashSet to use VectorBackedLinkList

In this CL, VectorBackedLinkedList is imported to NewLinkedHashSet. Also it removed old code that we can replace by VectorBackedLinkedList.
Updated constructor/destructor/assignment operator.

Change-Id: Ie0dcfe8751b09bc2547bd206d2d2c38655d406a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094494
Commit-Queue: Kei Nakashima <keinakashima@google.com>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749069}