Update a few STYLE_BUTTON buttons in mash.

mash/screenlock/screenlock.cc

 // Copyright 2016 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 "mash/screenlock/screenlock.h"
 
 #include "ash/public/interfaces/container.mojom.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mash/session/public/interfaces/session.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/shell/public/cpp/connector.h"
 #include "services/ui/public/cpp/property_type_converters.h"
 #include "ui/views/background.h"
-#include "ui/views/controls/button/label_button.h"
+#include "ui/views/controls/button/md_text_button.h"
 #include "ui/views/mus/aura_init.h"
 #include "ui/views/mus/native_widget_mus.h"
 #include "ui/views/mus/window_manager_connection.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace mash {
 namespace screenlock {
 namespace {
 
 class ScreenlockView : public views::WidgetDelegateView,
                        public views::ButtonListener {
  public:
   explicit ScreenlockView(shell::Connector* connector)
       : connector_(connector),
         unlock_button_(
-            new views::LabelButton(this, base::ASCIIToUTF16("Unlock"))) {
+            views::MdTextButton::Create(this, base::ASCIIToUTF16("Unlock"))) {
     set_background(views::Background::CreateSolidBackground(SK_ColorYELLOW));
-    unlock_button_->SetStyle(views::Button::STYLE_BUTTON);
     AddChildView(unlock_button_);
   }
   ~ScreenlockView() override {}
 
  private:
   // Overridden from views::WidgetDelegate:
   views::View* GetContentsView() override { return this; }
   base::string16 GetWindowTitle() const override {
     // TODO(beng): use resources.
     return base::ASCIIToUTF16("Screenlock");
@@ skipping 14 matching lines @@
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override {
     DCHECK_EQ(sender, unlock_button_);
     mash::session::mojom::SessionPtr session;
     connector_->ConnectToInterface("mojo:mash_session", &session);
     session->UnlockScreen();
   }
 
   shell::Connector* connector_;
-  views::LabelButton* unlock_button_;
+  views::MdTextButton* unlock_button_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenlockView);
 };
 
 }  // namespace
 
 Screenlock::Screenlock() {}
 Screenlock::~Screenlock() {}
 
 void Screenlock::OnStart(const shell::Identity& identity) {
@@ skipping 26 matching lines @@
   widget->Show();
 }
 
 void Screenlock::ScreenlockStateChanged(bool screen_locked) {
   if (!screen_locked)
     base::MessageLoop::current()->QuitWhenIdle();
 }
 
 }  // namespace screenlock
 }  // namespace mash