Turn on -Wdelete-non-virtual-dtor for chromeos as well.

views/widget/tooltip_window_gtk.h

 // Copyright (c) 2010 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 VIEWS_WIDGET_TOOLTIP_WINDOW_GTK_H_
 #define VIEWS_WIDGET_TOOLTIP_WINDOW_GTK_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "ui/base/gtk/gtk_integers.h"
 #include "ui/base/gtk/gtk_signal.h"
 
 typedef struct _GdkEventExpose GdkEventExpose;
 typedef struct _GtkLabel GtkLabel;
 typedef struct _GtkWidget GtkWidget;
 typedef struct _GtkStyle GtkStyle;
 
 namespace views {
 
 // TooltipWindowGtk provides a customized tooltip window and gives us a
 // chance to apply RGBA colormap on it. This enables the GTK theme engine to
 // draw tooltip with nice shadow and rounded corner on ChromeOS.
 class TooltipWindowGtk {
  public:
   explicit TooltipWindowGtk(GtkWidget* widget);
-  ~TooltipWindowGtk();
+  virtual ~TooltipWindowGtk();
 
   // Sets tooltip text to display.
   void SetTooltipText(const std::wstring& text);
 
   GtkLabel* label();
 
  protected:
   CHROMEGTK_CALLBACK_1(TooltipWindowGtk, gboolean, OnPaint, GdkEventExpose*);
   CHROMEGTK_CALLBACK_1(TooltipWindowGtk, void, OnStyleSet, GtkStyle*);
 
  private:
   void Init();
 
   // Underlying widget of this tooltip window.
   GtkWidget* host_;
 
   // GtkWindow of this tooltip window.
   GtkWidget* window_;
 
   // The alignment and label widgets contained of the tooltip window.
   GtkWidget* alignment_;
   GtkWidget* label_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipWindowGtk);
 };
 
 } // namespace views
 
 #endif  // VIEWS_WIDGET_TOOLTIP_WINDOW_GTK_H_