Introduce BubbleDialogDelegateView, which extends DialogDelegateView

ui/views/bubble/bubble_frame_view.h

Index: ui/views/bubble/bubble_frame_view.h
diff --git a/ui/views/bubble/bubble_frame_view.h b/ui/views/bubble/bubble_frame_view.h
index ef1976253af59312c6882f587748cd15be87ceda..f9d3f30e4ae2e57a6fa193f6a36fb6a71c3efb68 100644
--- a/ui/views/bubble/bubble_frame_view.h
+++ b/ui/views/bubble/bubble_frame_view.h
@@ -59,7 +59,6 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
   gfx::Size GetMaximumSize() const override;
   void Layout() override;
   const char* GetClassName() const override;
-  void ChildPreferredSizeChanged(View* child) override;
   void OnThemeChanged() override;
   void OnNativeThemeChanged(const ui::NativeTheme* theme) override;
 
@@ -72,9 +71,7 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
 
   gfx::Insets content_margins() const { return content_margins_; }
 
-  void SetTitlebarExtraView(scoped_ptr<View> view);
-
-  void SetFootnoteView(scoped_ptr<View> view);
+  void SetFootnoteView(View* view);
 
   // Given the size of the contents and the rect to point at, returns the bounds
   // of the bubble window. The bubble's arrow location may change if the bubble
@@ -124,10 +121,6 @@ class VIEWS_EXPORT BubbleFrameView : public NonClientFrameView,
   Label* title_;
   LabelButton* close_;
 
-  // When supplied, this view is placed in the titlebar between the title and
-  // (x) close button.
-  View* titlebar_extra_view_;
-
   // A view to contain the footnote view, if it exists.
   View* footnote_container_;