Fix a bug that old height is set in DoUpdateIfPossible().

ui/message_center/views/message_list_view.cc

Index: ui/message_center/views/message_list_view.cc
diff --git a/ui/message_center/views/message_list_view.cc b/ui/message_center/views/message_list_view.cc
index 06cce39c28a3b0defe6e473284cfcea9da3e3661..653b3f825a6fea4004c1f07a230e1f38bc848424 100644
--- a/ui/message_center/views/message_list_view.cc
+++ b/ui/message_center/views/message_list_view.cc
@@ -349,15 +349,17 @@ void MessageListView::DoUpdateIfPossible() {
     return;
   }
 
-  int new_height = GetHeightForWidth(child_area.width() + GetInsets().width());
-  SetSize(gfx::Size(child_area.width() + GetInsets().width(), new_height));
-
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableMessageCenterAlwaysScrollUpUponNotificationRemoval))
     AnimateNotificationsBelowTarget();
   else
     AnimateNotifications();
 
+  // Should calculate and set new size after calling AnimateNotifications()
+  // because fixed_height_ may be updated in it.
+  int new_height = GetHeightForWidth(child_area.width() + GetInsets().width());
+  SetSize(gfx::Size(child_area.width() + GetInsets().width(), new_height));
+
   adding_views_.clear();
   deleting_views_.clear();