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

chrome/browser/gtk/translate_infobars.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/translate_infobars.h"
 
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 131 matching lines @@
 }  // namespace
 
 TranslateInfoBar::TranslateInfoBar(TranslateInfoBarDelegate* delegate)
     : InfoBar(delegate),
       background_error_percent_(0),
       state_(TranslateInfoBarDelegate::kTranslateNone),
       translation_pending_(false),
       swapped_language_placeholders_(false) {
   // Initialize slide animation for transitioning to and from error state.
   error_animation_.reset(new SlideAnimation(this));
-  error_animation_->SetTweenType(SlideAnimation::NONE);
+  error_animation_->SetTweenType(Tween::LINEAR);
   error_animation_->SetSlideDuration(500);
 
   BuildWidgets();
 
   // Register for PAGE_TRANSLATED notification.
   notification_registrar_.Add(this, NotificationType::PAGE_TRANSLATED,
       Source<TabContents>(GetDelegate()->tab_contents()));
 }
 
 TranslateInfoBar::~TranslateInfoBar() {
@@ skipping 412 matching lines @@
     options_menu_menu_.reset(new MenuGtk(this, options_menu_model_.get()));
   }
   options_menu_menu_->Popup(sender, 1, gtk_get_current_event_time());
 }
 
 // TranslateInfoBarDelegate, InfoBarDelegate overrides: ------------------
 
 InfoBar* TranslateInfoBarDelegate::CreateInfoBar() {
   return new TranslateInfoBar(this);
 }