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This CL rearranges cleanup and removal notification such that removal
notification is always the last notification issued for or by any node.

Change-Id: Ia83c58a3995e226c4860640f7096cae6e0aed77b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2231265Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775314}