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This makes the detached bookmarks items vertically centered.

Bug: 863697
Change-Id: Icf6529ec0b33255dc8072d5bfacc2f32b0495f93
Reviewed-on: https://chromium-review.googlesource.com/1139191Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Charlene Yan <cyan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575746}