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A BookmarkNode's title can only be changed from the UI thread, but is
also read by the history backend thread via
HistoryBookmarkModel::GetBookmarks(). Hence, a lock must be acquired
before changing the title.

In practice, this race should be extremely unlikely (if not impossible)
since assignment of base::string16 may as well be atomic in practice.

Change-Id: I8b31b977efe8fdcb918be8692984b2eab9dd0411
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031041Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737357}