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Actually it does not have to do much with DetachableToolbarView.

It is used by BookmarkBarView to draw a button separator in the left
side of "Other bookmarks" folder. The "Other bookmarks" only appears
when you actually have bookmarks on it. So to separate it from the rest
of the Bookmarks bar nodes, a separator is drawn.

Screenshot: http://imgur.com/nW38lEy

BUG=None
TEST=open chrome, bookmark something in the "Other bookmarks" folder,
make sure you have "Bookmarks bar" shown, then make sure the separator
is there. No regressions observed.
R=sky@chromium.org

Review URL: https://codereview.chromium.org/798283002

Cr-Commit-Position: refs/heads/master@{#308371}