void IVisualStudioWorkspaceHost.OnDocumentClosed(DocumentId documentId, ITextBuffer textBuffer, TextLoader loader, bool updateActiveContext)
{
// TODO: Move this out to DocumentProvider. As is, this depends on being able to
// access the host document which will already be deleted in some cases, causing
// a crash. Until this is fixed, we will leak a HierarchyEventsSink every time a
// Mercury shared document is closed.
// UnsubscribeFromSharedHierarchyEvents(documentId);
_workspace.OnDocumentClosed(documentId, loader, updateActiveContext);
}