Add VectorIconButton functionality to ImageButton.

chrome/browser/ui/views/download/download_item_view.cc

Index: chrome/browser/ui/views/download/download_item_view.cc
diff --git a/chrome/browser/ui/views/download/download_item_view.cc b/chrome/browser/ui/views/download/download_item_view.cc
index fa2eff196f3d24b0b0a1132d49fcfb07c4d7476d..8a8291c90f9ec9005fb1e902118a4c1b50a70c8d 100644
--- a/chrome/browser/ui/views/download/download_item_view.cc
+++ b/chrome/browser/ui/views/download/download_item_view.cc
@@ -158,7 +158,9 @@ class SeparatorBorder : public views::FocusableBorder {
 class DownloadItemView::DropDownButton : public views::VectorIconButton {
  public:
   explicit DropDownButton(views::VectorIconButtonDelegate* delegate)
-      : views::VectorIconButton(delegate) {}
+      : views::VectorIconButton(delegate) {
+    SetPadding(gfx::Insets(kDropdownBorderWidth));
+  }
   ~DropDownButton() override {}
 
   // Promoted visibility to public.
@@ -194,8 +196,6 @@ DownloadItemView::DownloadItemView(DownloadItem* download_item,
   download()->AddObserver(this);
   set_context_menu_controller(this);
 
-  dropdown_button_->SetBorder(
-      views::CreateEmptyBorder(gfx::Insets(kDropdownBorderWidth)));
   AddChildView(dropdown_button_);
 
   LoadIcon();