Make MdTextButton a LabelButton, use it in the DL shelf.

ui/views/examples/button_example.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/examples/button_example.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
 #include "ui/resources/grit/ui_resources.h"
@@ skipping 47 matching lines @@
   container->AddChildView(styled_button);
 
   LabelButton* disabled_button =
       new LabelButton(this, ASCIIToUTF16("Disabled Button"));
   disabled_button->SetStyle(Button::STYLE_BUTTON);
   disabled_button->SetState(Button::STATE_DISABLED);
   container->AddChildView(disabled_button);
 
   container->AddChildView(new BlueButton(this, ASCIIToUTF16("Blue Button")));
 
-  container->AddChildView(
-      new MdTextButton(nullptr, base::ASCIIToUTF16("Material design")));
+  container->AddChildView(MdTextButton::CreateStandardButton(
+      nullptr, base::ASCIIToUTF16("Material design")));
 
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   image_button_ = new ImageButton(this);
   image_button_->SetFocusable(true);
   image_button_->SetImage(ImageButton::STATE_NORMAL,
                           rb.GetImageNamed(IDR_CLOSE).ToImageSkia());
   image_button_->SetImage(ImageButton::STATE_HOVERED,
                           rb.GetImageNamed(IDR_CLOSE_H).ToImageSkia());
   image_button_->SetImage(ImageButton::STATE_PRESSED,
                           rb.GetImageNamed(IDR_CLOSE_P).ToImageSkia());
@@ skipping 34 matching lines @@
 
 void ButtonExample::ButtonPressed(Button* sender, const ui::Event& event) {
   if (sender == label_button_)
     LabelButtonPressed(event);
   else
     PrintStatus("Image Button Pressed! count: %d", ++count_);
 }
 
 }  // namespace examples
 }  // namespace views