Implement Non-Closable Notification

ui/message_center/views/message_view.h

Index: ui/message_center/views/message_view.h
diff --git a/ui/message_center/views/message_view.h b/ui/message_center/views/message_view.h
index 47840df6b8f0e47dfb7043a363dda36e3d4d7ff3..26b2cd373193e77843a45d8fed1e8ffaf6ed1c39 100644
--- a/ui/message_center/views/message_view.h
+++ b/ui/message_center/views/message_view.h
@@ -46,8 +46,8 @@ const int kPaddingHorizontal = 18;
 const int kWebNotificationButtonWidth = 32;
 const int kWebNotificationIconSize = 40;
 
-// An base class for a notification entry. Contains background, close button
-// and other elements shared by derived notification views.
+// An base class for a notification entry. Contains background and other
+// elements shared by derived notification views.
 class MESSAGE_CENTER_EXPORT MessageView : public views::SlideOutView,
                                           public views::ButtonListener {
  public:
@@ -67,8 +67,9 @@ class MESSAGE_CENTER_EXPORT MessageView : public views::SlideOutView,
   // Creates a shadow around the notification.
   void CreateShadowBorder();
 
-  bool IsCloseButtonFocused();
-  void RequestFocusOnCloseButton();
+  virtual bool IsCloseButtonFocused();
+  virtual void RequestFocusOnCloseButton();
+  virtual bool IsClosable();
 
   void set_accessible_name(const base::string16& accessible_name) {
     accessible_name_ = accessible_name;
@@ -100,7 +101,6 @@ class MESSAGE_CENTER_EXPORT MessageView : public views::SlideOutView,
   void OnSlideOut() override;
 
   views::ImageView* small_image() { return small_image_view_.get(); }
-  views::ImageButton* close_button() { return close_button_.get(); }
   views::ScrollView* scroller() { return scroller_; }
 
  private:
@@ -108,7 +108,6 @@ class MESSAGE_CENTER_EXPORT MessageView : public views::SlideOutView,
   std::string notification_id_;
   NotifierId notifier_id_;
   views::View* background_view_;  // Owned by views hierarchy.
-  scoped_ptr<views::ImageButton> close_button_;
   scoped_ptr<views::ImageView> small_image_view_;
   views::ScrollView* scroller_;