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The enhanced bookmarks extension is being updated to rely solely on
server-generated persistent IDs, eliminating the need to create IDs
in Chrome client code.

This is effectively a revert of 0f7d5081
and 224e1d18.

BUG=413378

Review URL: https://codereview.chromium.org/568923004

Cr-Commit-Position: refs/heads/master@{#294694}