Makes it so when NSViewControllers go away that they remove their views from ...

chrome/browser/cocoa/bookmark_bar_controller.mm

 // 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.
 
 #include "app/l10n_util_mac.h"
 #include "app/resource_bundle.h"
 #include "base/mac_util.h"
 #include "base/nsimage_cache_mac.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
@@ skipping 72 matching lines @@
     tabObserver_.reset(
         new TabStripModelObserverBridge(browser_->tabstrip_model(), self));
 
     ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     folderImage_.reset([rb.GetNSImageNamed(IDR_BOOKMARK_BAR_FOLDER) retain]);
   }
   return self;
 }
 
 - (void)dealloc {
+  // Remove our view from its superview so it doesn't attempt to reference
+  // it when the controller is gone.
+  [[self view] removeFromSuperview];
   bridge_.reset(NULL);
   [[NSNotificationCenter defaultCenter] removeObserver:self];
   [super dealloc];
 }
 
 - (void)awakeFromNib {
   // We default to NOT open, which means height=0.
   DCHECK([[self view] isHidden]);  // Hidden so it's OK to change.
 
   // Set our initial height to zero, since that is what the superview
@@ skipping 632 matching lines @@
 
 - (void)setUrlDelegate:(id<BookmarkURLOpener>)urlDelegate {
   urlDelegate_ = urlDelegate;
 }
 
 - (NSArray*)buttons {
   return buttons_.get();
 }
 
 @end