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This metrics shows fullness of the full title field in specifics. Since
most of bookmarks were reuploaded, this metric is not needed anymore.

Bug: 1153774
Change-Id: Iacc69717212f6ec41cd327c6a0ade0f677768d32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600831Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Rushan Suleymanov <rushans@google.com>
Cr-Commit-Position: refs/heads/master@{#843558}