Remove unused Textfield::SetShadows.

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 95b32cf2f805e0878e315b558f0f7b56b5b73392..217bb57a1247b35ab9fe89594162a04427f8c6ba 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -411,11 +411,6 @@ void Textfield::UseDefaultSelectionTextColor() {
   SchedulePaint();
 }
 
-void Textfield::SetShadows(const gfx::ShadowValues& shadows) {
-  GetRenderText()->set_shadows(shadows);
-  SchedulePaint();
-}
-
 SkColor Textfield::GetSelectionBackgroundColor() const {
   return use_default_selection_background_color_ ?
       GetNativeTheme()->GetSystemColor(