Revert "Fix a ton of compiler warnings."

chrome/browser/gtk/info_bubble_gtk.h

 // Copyright (c) 2009 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.
 
 // This is the GTK implementation of InfoBubbles.  InfoBubbles are like
 // dialogs, but they point to a given element on the screen.  You should call
 // InfoBubbleGtk::Show, which will create and display a bubble.  The object is
 // self deleting, when the bubble is closed, you will be notified via
 // InfoBubbleGtkDelegate::InfoBubbleClosing().  Then the widgets and the
 // underlying object will be destroyed.  You can also close and destroy the
@@ skipping 16 matching lines @@
 
 class InfoBubbleGtkDelegate {
  public:
   // Called when the InfoBubble is closing and is about to be deleted.
   // |closed_by_escape| is true if the close is the result of pressing escape.
   virtual void InfoBubbleClosing(InfoBubbleGtk* info_bubble,
                                  bool closed_by_escape) = 0;
 
   // NOTE: The Views interface has CloseOnEscape, except I can't find a place
   // where it ever returns false, so we always allow you to close via escape.
-
- protected:
-  ~InfoBubbleGtkDelegate() {}
 };
 
 class InfoBubbleGtk : public NotificationObserver {
  public:
   // Show an InfoBubble, pointing at the area |rect| (in screen coordinates).
   // An infobubble will try to fit on the screen, so it can point to any edge
   // of |rect|.  The bubble will host the |content| widget.  The |delegate|
   // will be notified when things like closing are happening.
   static InfoBubbleGtk* Show(GtkWindow* transient_toplevel,
                              const gfx::Rect& rect,
@@ skipping 99 matching lines @@
   // Where we want our window to be positioned on the screen.
   int screen_x_;
   int screen_y_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBubbleGtk);
 };
 
 #endif  // CHROME_BROWSER_GTK_INFO_BUBBLE_GTK_H_