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This change is a follow up to this CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2018094

1. We remove the tree_id() method from the TreeWrapper and use
GetTreeID() instead.

2. We use wrapper->GetNodeFromTree() instead of
wrapper->tree()->GetFromId().

3. We overload GetNodeFromTree to take fewer parameters.

Change-Id: Icb2dd678ca10f1faf67ddc536351f1b51728f02b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028734
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737021}