Use new Windows close icon and renamed expand icons in notifications.

ui/message_center/views/message_view.cc

Index: ui/message_center/views/message_view.cc
diff --git a/ui/message_center/views/message_view.cc b/ui/message_center/views/message_view.cc
index bc6ea719caff3f05038061789beabe89c4d09c57..48589818e22032468802c929798366c69f7da97f 100644
--- a/ui/message_center/views/message_view.cc
+++ b/ui/message_center/views/message_view.cc
@@ -307,9 +307,9 @@ MessageView::MessageView(const Notification& notification,
 
   ControlButton *expand = new ControlButton(this);
   expand->SetPadding(-kExpandIconRightPadding, -kExpandIconBottomPadding);
-  expand->SetNormalImage(IDR_NOTIFICATIONS_EXPAND);
-  expand->SetHoveredImage(IDR_NOTIFICATIONS_EXPAND_HOVER);
-  expand->SetPressedImage(IDR_NOTIFICATIONS_EXPAND_PRESSED);
+  expand->SetNormalImage(IDR_NOTIFICATION_EXPAND);
+  expand->SetHoveredImage(IDR_NOTIFICATION_EXPAND_HOVER);
+  expand->SetPressedImage(IDR_NOTIFICATION_EXPAND_PRESSED);
   expand->set_owned_by_client();
   expand_button_.reset(expand);