GitLab

Also moved BookmarksBridge#BookmarkItem to bookmarks component.

BUG=386785

Review URL: https://codereview.chromium.org/459973004

Cr-Commit-Position: refs/heads/master@{#289695}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289695 0039d316-1c4b-4281-b951-d872f2087c98