Virtual destructors should have virtual keyword.

chrome/browser/ui/cocoa/constrained_window_mac.h

 // Copyright (c) 2011 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_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_MAC_H_
 #pragma once
 
 #import <Cocoa/Cocoa.h>
 
@@ skipping 65 matching lines @@
   SEL didEndSelector_;
 };
 
 // Subclass this for a dialog delegate that displays a custom sheet, e.g. loaded
 // from a nib file.
 class ConstrainedWindowMacDelegateCustomSheet
     : public ConstrainedWindowMacDelegate {
  public:
   ConstrainedWindowMacDelegateCustomSheet();
   ConstrainedWindowMacDelegateCustomSheet(id delegate, SEL didEndSelector);
-  ~ConstrainedWindowMacDelegateCustomSheet();
+  virtual ~ConstrainedWindowMacDelegateCustomSheet();
 
  protected:
   // For when you need to delay initalization after the constructor call.
   void init(NSWindow* sheet, id delegate, SEL didEndSelector);
   void set_sheet(NSWindow* sheet);
   NSWindow* sheet() { return customSheet_; }
 
  private:
   virtual void RunSheet(GTMWindowSheetController* sheetController,
                         NSView* view);
@@ skipping 42 matching lines @@
   // Controller of the window that contains this sheet.
   BrowserWindowController* controller_;
 
   // Stores if |ShowConstrainedWindow()| was called.
   bool should_be_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(ConstrainedWindowMac);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_CONSTRAINED_WINDOW_MAC_H_
-