Update dialog close buttons to use vector icons and ripples.

ui/views/bubble/bubble_dialog_delegate_unittest.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 "ui/views/bubble/bubble_dialog_delegate.h"
 
 #include <stddef.h>
 
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
@@ skipping 303 matching lines @@
   }
 
   {
     std::unique_ptr<Widget> anchor_widget(CreateTestWidget());
     TestBubbleDialogDelegateView* bubble_delegate =
         new TestBubbleDialogDelegateView(anchor_widget->GetContentsView());
     Widget* bubble_widget =
         BubbleDialogDelegateView::CreateBubble(bubble_delegate);
     bubble_widget->Show();
     BubbleFrameView* frame_view = bubble_delegate->GetBubbleFrameView();
-    LabelButton* close_button = frame_view->close_;
+    Button* close_button = frame_view->close_;
     ASSERT_TRUE(close_button);
     frame_view->ButtonPressed(
         close_button,
         ui::MouseEvent(ui::ET_MOUSE_PRESSED, gfx::Point(), gfx::Point(),
                        ui::EventTimeForNow(), ui::EF_NONE, ui::EF_NONE));
     EXPECT_TRUE(bubble_widget->IsClosed());
   }
 }
 
 }  // namespace views