Update dialog close buttons to use vector icons and ripples.

ui/views/controls/button/vector_icon_button_delegate.h

 // 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.
 
-#ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_OBSERVER_H_
-#define UI_VIEWS_WIDGET_DESKTOP_AURA_X11_DESKTOP_HANDLER_OBSERVER_H_
+#ifndef UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_DELEGATE_BUTTON_H_
+#define UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_DELEGATE_BUTTON_H_
 
-#include <string>
-
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/views/controls/button/button.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 
-class VIEWS_EXPORT X11DesktopHandlerObserver {
+// A ButtonListener that also provides a color to use for drawing an icon.
+class VIEWS_EXPORT VectorIconButtonDelegate : public ButtonListener {
  public:
-  // Called when the (platform-specific) workspace ID changes to
-  // |new_workspace|.
-  virtual void OnWorkspaceChanged(const std::string& new_workspace) = 0;
+  virtual SkColor GetVectorIconBaseColor() const;
 
  protected:
-  virtual ~X11DesktopHandlerObserver() {}
+  ~VectorIconButtonDelegate() override {}
 };
 
 }  // namespace views
 
-#endif  // UI_DISPLAY_DESKTOP_OBSERVER_H_
+#endif  // UI_VIEWS_CONTROLS_BUTTON_VECTOR_ICON_BUTTON_DELEGATE_H_