Remove some more LabelButton::STYLE_BUTTON references.

ash/shell/lock_view.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 "ash/common/session/session_state_delegate.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/text_utils.h"
-#include "ui/views/controls/button/label_button.h"
+#include "ui/views/controls/button/md_text_button.h"
 #include "ui/views/corewm/tooltip_controller.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 namespace shell {
 
 class LockView : public views::WidgetDelegateView,
                  public views::ButtonListener {
  public:
   LockView()
       : unlock_button_(
-            new views::LabelButton(this, base::ASCIIToUTF16("Unlock"))) {
-    unlock_button_->SetStyle(views::Button::STYLE_BUTTON);
+            views::MdTextButton::CreateMdButton(this,
+                                                base::ASCIIToUTF16("Unlock"))) {
     AddChildView(unlock_button_);
   }
   ~LockView() override {}
 
   // Overridden from views::View:
   gfx::Size GetPreferredSize() const override { return gfx::Size(500, 400); }
 
  private:
   // Overridden from views::View:
   void OnPaint(gfx::Canvas* canvas) override {
@@ skipping 24 matching lines @@
     WmShell::Get()->GetSessionStateDelegate()->UnlockScreen();
   }
 
   // Overridden from views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override {
     DCHECK(sender == unlock_button_);
     GetWidget()->Close();
   }
 
   gfx::FontList font_list_;
-  views::LabelButton* unlock_button_;
+  views::Button* unlock_button_;
 
   DISALLOW_COPY_AND_ASSIGN(LockView);
 };
 
 void CreateLockScreen() {
   LockView* lock_view = new LockView;
   views::Widget* widget = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   gfx::Size ps = lock_view->GetPreferredSize();
@@ skipping 11 matching lines @@
   widget->GetNativeView()->SetName("LockView");
   widget->GetNativeView()->Focus();
 
   // TODO: it shouldn't be necessary to invoke UpdateTooltip() here.
   Shell::GetInstance()->tooltip_controller()->UpdateTooltip(
       widget->GetNativeView());
 }
 
 }  // namespace shell
 }  // namespace ash