Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/vector_icon_button.h

Index: ui/views/controls/button/vector_icon_button.h
diff --git a/ui/views/controls/button/vector_icon_button.h b/ui/views/controls/button/vector_icon_button.h
index 66f1b93864ec3820893f78adebaa62bc5a486472..c7185b4d7648f525a06b366547e6f7e7050a56b7 100644
--- a/ui/views/controls/button/vector_icon_button.h
+++ b/ui/views/controls/button/vector_icon_button.h
@@ -17,15 +17,13 @@ namespace views {
 
 class VectorIconButtonDelegate;
 
-// A button that has an image and no text, with the image defined by a vector
-// icon identifier.
+// A button that has a image from a vector icon and no text.
 class VIEWS_EXPORT VectorIconButton : public views::ImageButton {
  public:
   explicit VectorIconButton(VectorIconButtonDelegate* delegate);
   ~VectorIconButton() override;
 
-  // Sets the icon to display and provides a callback which should return the
-  // text color from which to derive this icon's color.
+  // Sets the icon to display.
   void SetIcon(const gfx::VectorIcon& icon);
 
   // views::ImageButton:
@@ -33,9 +31,6 @@ class VIEWS_EXPORT VectorIconButton : public views::ImageButton {
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
  private:
-  // Performs the work common to both SetIcon() variants.
-  void OnSetIcon();
-
   // Called when something may have affected the button's images or colors.
   void UpdateImagesAndColors();