Refactors animation to allow for cleaner subclassing. I'm doing this

chrome/browser/gtk/browser_actions_toolbar_gtk.cc

 // 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.
 
 #include "chrome/browser/gtk/browser_actions_toolbar_gtk.h"
 
 #include <vector>
 
 #include "base/i18n/rtl.h"
 #include "chrome/browser/browser.h"
@@ skipping 837 matching lines @@
     return FALSE;
 
   void* data = g_object_get_data(G_OBJECT(menu_item), kMenuItemKey);
   DCHECK(data);
   BrowserActionButton* button = static_cast<BrowserActionButton*>(data);
   button->GetContextMenu()->PopupAsContext(event->time);
   return TRUE;
 }
 
 void BrowserActionsToolbarGtk::OnButtonShowOrHide(GtkWidget* sender) {
-  if (!resize_animation_.IsAnimating())
+  if (!resize_animation_.is_animating())
     UpdateChevronVisibility();
 }