Revert "Fix a ton of compiler warnings."

chrome/common/gtk_tree.h

Index: chrome/common/gtk_tree.h
diff --git a/chrome/common/gtk_tree.h b/chrome/common/gtk_tree.h
index 4e74efafc9ee173878e04b6be33646882de6e636..8caa64cc21375d459f0f55607eb70aefc666150b 100644
--- a/chrome/common/gtk_tree.h
+++ b/chrome/common/gtk_tree.h
@@ -43,9 +43,6 @@ class ModelAdapter : public TableModelObserver {
     // 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.