[MD] Eliminate as many SetStyle(STYLE_BUTTON) calls as possible.

ui/views/window/dialog_client_view.cc

Index: ui/views/window/dialog_client_view.cc
diff --git a/ui/views/window/dialog_client_view.cc b/ui/views/window/dialog_client_view.cc
index 358c81c39120b8afa346769ccd0d77a8c3ee1bc2..ec7794cb34df9d3f55db2c4805af877fd9628652 100644
--- a/ui/views/window/dialog_client_view.cc
+++ b/ui/views/window/dialog_client_view.cc
@@ -306,17 +306,10 @@ LabelButton* DialogClientView::CreateDialogButton(ui::DialogButton type) {
   if (GetDialogDelegate()->UseNewStyleForThisDialog() &&
       GetDialogDelegate()->GetDefaultDialogButton() == type &&
       GetDialogDelegate()->ShouldDefaultButtonBeBlue()) {
-    if (ui::MaterialDesignController::IsSecondaryUiMaterial()) {
-      MdTextButton* md_button = MdTextButton::CreateMdButton(this, title);
-      md_button->SetCallToAction(MdTextButton::STRONG_CALL_TO_ACTION);
-      button = md_button;
-    } else {
-      button = new BlueButton(this, title);
-    }
+    return MdTextButton::CreateSecondaryUiBlueButton(this, title);
   } else {
     button = MdTextButton::CreateSecondaryUiButton(this, title);
   }
-  Button::ConfigureDefaultFocus(button);
 
   const int kDialogMinButtonWidth = 75;
   button->SetMinSize(gfx::Size(kDialogMinButtonWidth, 0));