Remove the most obvious dead code from message center.

ui/message_center/views/message_center_view.h

Index: ui/message_center/views/message_center_view.h
diff --git a/ui/message_center/views/message_center_view.h b/ui/message_center/views/message_center_view.h
index 593c24f462685792ab9013c0792ab0f26341c4e0..0ffaea8eea03e6f5b7cacbe81fe5765c5a65992c 100644
--- a/ui/message_center/views/message_center_view.h
+++ b/ui/message_center/views/message_center_view.h
@@ -11,6 +11,7 @@
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/message_center_observer.h"
 #include "ui/message_center/notification_list.h"
+#include "ui/views/controls/button/button.h"
 
 namespace ui {
 class MultiAnimation;
@@ -24,46 +25,14 @@ namespace message_center {
 
 class MessageCenter;
 class MessageCenterBubble;
+class NotificationCenterButton;
+class MessageCenterButtonBar;
 class MessageCenterTray;
 class MessageCenterView;
 class MessageView;
 class MessageListView;
 class NotifierSettingsView;
 
-// MessageCenterButtonBar //////////////////////////////////////////////////////
-
-// If you know how to better hide this implementation class please do so, and
-// otherwise please refrain from using it :-).
-class MessageCenterButtonBar : public views::View {
- public:
-  MessageCenterButtonBar(MessageCenterView* message_center_view,
-                         MessageCenter* message_center);
-  virtual ~MessageCenterButtonBar();
-
-  virtual void SetAllButtonsEnabled(bool enabled);
-
-  void SetCloseAllVisible(bool visible);
-
- protected:
-  MessageCenterView* message_center_view() const {
-    return message_center_view_;
-  }
-  MessageCenter* message_center() const { return message_center_; }
-  MessageCenterTray* tray() const { return tray_; }
-  views::Button* close_all_button() const { return close_all_button_; }
-  void set_close_all_button(views::Button* button) {
-    close_all_button_ = button;
-  }
-
- private:
-  MessageCenterView* message_center_view_;  // Weak reference.
-  MessageCenter* message_center_;  // Weak reference.
-  MessageCenterTray* tray_;  // Weak reference.
-  views::Button* close_all_button_;
-
-  DISALLOW_COPY_AND_ASSIGN(MessageCenterButtonBar);
-};
-
 // MessageCenterView ///////////////////////////////////////////////////////////
 
 class MESSAGE_CENTER_EXPORT MessageCenterView : public views::View,