Add SetProminent() to MdTextButton to create blue buttons.

ui/views/examples/button_sticker_sheet.cc

Index: ui/views/examples/button_sticker_sheet.cc
diff --git a/ui/views/examples/button_sticker_sheet.cc b/ui/views/examples/button_sticker_sheet.cc
index fd780937df84343fd7b38d54f86b0db1e0416234..dc98a833cd20b66b234147ebee7cada0eebb8cd4 100644
--- a/ui/views/examples/button_sticker_sheet.cc
+++ b/ui/views/examples/button_sticker_sheet.cc
@@ -73,7 +73,7 @@ void MakeButtonsInState(MdTextButton** primary,
                         Button::ButtonState state) {
   const base::string16 button_text = base::ASCIIToUTF16("Button");
   *primary = MdTextButton::Create(listener, button_text);
-  (*primary)->SetCallToAction(true);
+  (*primary)->SetProminent(true);
   (*primary)->SetState(state);
 
   *secondary = MdTextButton::Create(listener, button_text);