GitLab

Folders should only have their id set by the server, and the clients
should only set the remote id on clips they created themselves.

Additionally, EnhancedBookmarkModel now monitors the remote id field for bookmarks, and initiates a de-duping protocol whenever two (or more) nodes with the same id are detected.
BUG=413876

Review URL: https://codereview.chromium.org/563363002

Cr-Commit-Position: refs/heads/master@{#295790}