Make all text buttons on download shelf work well with themes, not just

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 7cbd005bfa6373da77cca23082734c571e6244c0..8c9de062a37a15d9470331fbd4ba7ac5f49a35d8 100644
--- a/chrome/browser/ui/views/download/download_item_view.cc
+++ b/chrome/browser/ui/views/download/download_item_view.cc
@@ -804,13 +804,12 @@ void DownloadItemView::UpdateColorsFromTheme() {
   SetBorder(base::MakeUnique<SeparatorBorder>(GetThemeProvider()->GetColor(
       ThemeProperties::COLOR_TOOLBAR_VERTICAL_SEPARATOR)));
 
-  SkColor text_color = GetTextColor();
   if (dangerous_download_label_)
-    dangerous_download_label_->SetEnabledColor(text_color);
+    dangerous_download_label_->SetEnabledColor(GetTextColor());
   if (save_button_)
-    save_button_->SetEnabledTextColors(text_color);
+    shelf_->ConfigureButtonForTheme(save_button_);
   if (discard_button_)
-    discard_button_->SetEnabledTextColors(text_color);
+    shelf_->ConfigureButtonForTheme(discard_button_);
 }
 
 void DownloadItemView::ShowContextMenuImpl(const gfx::Rect& rect,