[Views] Add a capability to the bubble delegate to be able to show the title in BaseFont.

ui/views/bubble/bubble_frame_view.cc

Index: ui/views/bubble/bubble_frame_view.cc
diff --git a/ui/views/bubble/bubble_frame_view.cc b/ui/views/bubble/bubble_frame_view.cc
index 8df63f1e48dc0269dca168f4c0af07557660d694..eb4808d66ff65b74105f6d4fed5a9267cddc7411 100644
--- a/ui/views/bubble/bubble_frame_view.cc
+++ b/ui/views/bubble/bubble_frame_view.cc
@@ -161,6 +161,11 @@ void BubbleFrameView::UpdateWindowTitle() {
   ResetWindowControls();
 }
 
+void BubbleFrameView::ShowTitleInBaseFont() {
+  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
+  title_->SetFontList(rb.GetFontList(ui::ResourceBundle::BaseFont));
+}
+
 gfx::Insets BubbleFrameView::GetInsets() const {
   gfx::Insets insets = content_margins_;
   const int title_height = title_->text().empty() ? 0 :