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LinkedListInVector maintains a linked list in a vector.
It uses prev/next indices instead of pointers.
Implemented iterators and insert functions.

Change-Id: I7e15734b5c209618c4760efe65b7e68f1f827b62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089543Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Kei Nakashima <keinakashima@google.com>
Cr-Commit-Position: refs/heads/master@{#748125}