Update dialog close buttons to use vector icons and ripples.

ui/views/bubble/bubble_frame_view.h

Index: ui/views/bubble/bubble_frame_view.h
diff --git a/ui/views/bubble/bubble_frame_view.h b/ui/views/bubble/bubble_frame_view.h
index 90f1030c7d979ae0b73220822382e63fcfc448dc..06054a736406b159b9301853db00433f7f0bd88b 100644
--- a/ui/views/bubble/bubble_frame_view.h
+++ b/ui/views/bubble/bubble_frame_view.h
@@ -19,7 +19,7 @@ class FontList;
 namespace views {
 
 class Label;
-class LabelButton;
+class Button;
 class BubbleBorder;
 class ImageView;
 
@@ -35,7 +35,7 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
   ~BubbleFrameView() override;
 
   // Creates a close button used in the corner of the dialog.
-  static LabelButton* CreateCloseButton(ButtonListener* listener);
+  static Button* CreateCloseButton(ButtonListener* listener);
 
   // NonClientFrameView overrides:
   gfx::Rect GetBoundsForClientView() const override;
@@ -85,7 +85,7 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
 
   bool close_button_clicked() const { return close_button_clicked_; }
 
-  LabelButton* GetCloseButtonForTest() { return close_; }
+  Button* GetCloseButtonForTest() { return close_; }
 
  protected:
   // Returns the available screen bounds if the frame were to show in |rect|.
@@ -125,7 +125,7 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
   // The optional title icon, title, and (x) close button.
   views::ImageView* title_icon_;
   Label* title_;
-  LabelButton* close_;
+  Button* close_;
 
   // A view to contain the footnote view, if it exists.
   View* footnote_container_;