Revert "Fix a ton of compiler warnings."

chrome/common/gtk_tree.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_GTK_TREE_H_
 #define CHROME_COMMON_GTK_TREE_H_
 
 #include <gtk/gtk.h>
 
 #include "app/table_model_observer.h"
@@ skipping 25 matching lines @@
     // Should fill in the column and row.
     virtual void SetColumnValues(int row, GtkTreeIter* iter) = 0;
 
     // Called after any change to the TableModel.  Overriding optional.
     virtual void OnAnyModelUpdate() {}
 
     // When the TableModel has been completely changed, called by OnModelChanged
     // after clearing the list store.  Can be overriden by the delegate if it
     // needs to do extra initialization before the list store is populated.
     virtual void OnModelChanged() {}
-
-   protected:
-    ~Delegate() {}
   };
 
   // |table_model| may be NULL.
   explicit ModelAdapter(Delegate* delegate, GtkListStore* list_store,
                         TableModel* table_model);
   virtual ~ModelAdapter() {}
 
   // Replace the TableModel with a different one.  If the list store currenty
   // has items this would cause weirdness, so this should generally only be
   // called during the Delegate's OnModelChanged call, or if the adapter was
@@ skipping 13 matching lines @@
   Delegate* delegate_;
   GtkListStore* list_store_;
   TableModel* table_model_;
 
   DISALLOW_COPY_AND_ASSIGN(ModelAdapter);
 };
 
 }  // namespace gtk_tree
 
 #endif  // CHROME_COMMON_GTK_TREE_H_