views examples: remove obsolete CTA button example

ui/views/examples/button_example.cc

Index: ui/views/examples/button_example.cc
diff --git a/ui/views/examples/button_example.cc b/ui/views/examples/button_example.cc
index de882104bc39468e1e0ec4ba5eb4fc1183f7ab03..feefc83762afe539436f139fd0a57d95ae79ad04 100644
--- a/ui/views/examples/button_example.cc
+++ b/ui/views/examples/button_example.cc
@@ -68,11 +68,6 @@ void ButtonExample::CreateExampleView(View* container) {
   md_default_button_->SetIsDefault(true);
   container->AddChildView(md_default_button_);
 
-  md_prominent_button_ =

[sky, 2016/11/07 17:03:31]

Remove field too.

-      MdTextButton::Create(this, base::ASCIIToUTF16("Call to action"));
-  md_prominent_button_->SetProminent(true);
-  container->AddChildView(md_prominent_button_);
-
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   image_button_ = new ImageButton(this);
   image_button_->SetFocusForPlatform();