Revert "Fix a ton of compiler warnings."

app/tree_model.h

Index: app/tree_model.h
diff --git a/app/tree_model.h b/app/tree_model.h
index f6e2c1478066293581e0ef5d1be98be7ef720513..f6d8da316a344b93e551a3a7dcf01696a8fb8bb8 100644
--- a/app/tree_model.h
+++ b/app/tree_model.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2008 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.
 
@@ -21,9 +21,6 @@ class TreeModelNode {
  public:
   // Returns the title for the node.
   virtual const std::wstring& GetTitle() const = 0;
-
- protected:
-  ~TreeModelNode() {}
 };
 
 // Observer for the TreeModel. Notified of significant events to the model.
@@ -48,9 +45,6 @@ class TreeModelObserver {
 
   // Notification that the contents of a node has changed.
   virtual void TreeNodeChanged(TreeModel* model, TreeModelNode* node) = 0;
-
- protected:
-  ~TreeModelObserver() {}
 };
 
 // TreeModel ------------------------------------------------------------------
@@ -89,9 +83,6 @@ class TreeModel {
   // default icon. The index is relative to the list of icons returned from
   // GetIcons.
   virtual int GetIconIndex(TreeModelNode* node) { return -1; }
-
- protected:
-  ~TreeModel() {}
 };
 
 #endif  // APP_TREE_TREE_MODEL_H_