Virtual destructors should have virtual keyword.

chrome/renderer/searchbox.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_RENDERER_SEARCHBOX_H_
 #define CHROME_RENDERER_SEARCHBOX_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/string16.h"
 #include "chrome/common/instant_types.h"
 #include "content/renderer/render_view_observer.h"
 #include "content/renderer/render_view_observer_tracker.h"
 #include "ui/gfx/rect.h"
 
 class SearchBox : public RenderViewObserver,
                   public RenderViewObserverTracker<SearchBox> {
  public:
   explicit SearchBox(RenderView* render_view);
-  ~SearchBox();
+  virtual ~SearchBox();
 
   // Sends ViewHostMsg_SetSuggestions to the browser.
   void SetSuggestions(const std::vector<std::string>& suggestions,
                       InstantCompleteBehavior behavior);
 
   const string16& value() { return value_; }
   bool verbatim() { return verbatim_; }
   uint32 selection_start() { return selection_start_; }
   uint32 selection_end() { return selection_end_; }
   const gfx::Rect& rect() { return rect_; }
@@ skipping 20 matching lines @@
   string16 value_;
   bool verbatim_;
   uint32 selection_start_;
   uint32 selection_end_;
   gfx::Rect rect_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchBox);
 };
 
 #endif  // CHROME_RENDERER_SEARCHBOX_H_