Update appearance of omnibox focus for MD.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index dc0a9f2535810941f1720d9e131d0061120ed26d..b31dd2d0737218a3d623dd54b9eb3ba9f2be0594 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -573,10 +573,6 @@ void Textfield::ExecuteCommand(int command_id) {
   ExecuteCommand(command_id, ui::EF_NONE);
 }
 
-void Textfield::SetFocusPainter(std::unique_ptr<Painter> focus_painter) {
-  focus_painter_ = std::move(focus_painter);
-}
-
 bool Textfield::HasTextBeingDragged() {
   return initiating_drag_;
 }