Use buttons from DialogClientView in BookmakBubbleView.

ui/views/bubble/bubble_dialog_delegate.h

Index: ui/views/bubble/bubble_dialog_delegate.h
diff --git a/ui/views/bubble/bubble_dialog_delegate.h b/ui/views/bubble/bubble_dialog_delegate.h
index 81a3a4ca9d8bff20f9c15c2629c7d9873fc99fc1..30be96f44bb759628c590487585d036433d7906b 100644
--- a/ui/views/bubble/bubble_dialog_delegate.h
+++ b/ui/views/bubble/bubble_dialog_delegate.h
@@ -144,6 +144,10 @@ class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
   void SetAnchorView(View* anchor_view);
   void SetAnchorRect(const gfx::Rect& rect);
 
+  void set_button_row_insets(const gfx::Insets& insets) {
+    button_row_insets_ = insets;
+  }
+
   // Resize and potentially move the bubble to fit the content's preferred size.
   void SizeToContents();
 
@@ -187,7 +191,8 @@ class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
   SkColor color_;
   bool color_explicitly_set_;
 
-  // The margins between the content and the inside of the border.
+  // The margins between the content (including buttons) and the inside of the
+  // border.
   gfx::Insets margins_;
 
   // The margins around the title.
@@ -197,6 +202,10 @@ class VIEWS_EXPORT BubbleDialogDelegateView : public DialogDelegateView,
   // Insets applied to the |anchor_view_| bounds.
   gfx::Insets anchor_view_insets_;
 
+  // Insets around the button row (when buttons are present). Note that bottom
+  // and side insets from |margins_| are already added around the button row.
+  gfx::Insets button_row_insets_;
+
   // Specifies whether the bubble (or its border) handles mouse events, etc.
   bool accept_events_;