This is the default Ubuntu theme, with smaller icons everywhere (excepted in toolbars where non-stock 24x24 icons are used... Didn't know how to fix it).
If you want to have a smaller look...
As udolf said, you can make it even smaller.
In the style "clearlooks-default" section, add (as you want) :
GtkWidget::focus-padding = 0 # focus line very close to the border
GtkWidget::focus-line-width = 0 # no more focus line !