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has only forward declaration of NodeSetSizePosInSetInfo. Therefore,
move declaration from ax_tree.cc.

std: :unordered_map<T, U> requires U to be fully declared. ax_tree.h
Bug: 957519
Change-Id: Ic1f4bf3ebfea229ece84251e46d4461b31873868
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132403Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760588}