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

chrome/browser/gtk/tabs/tab_strip_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/tabs/tab_strip_gtk.h"
 
 #include <algorithm>
 
 #include "app/gtk_dnd_util.h"
 #include "app/resource_bundle.h"
@@ skipping 112 matching lines @@
         end_unselected_width_(0),
         layout_on_completion_(false),
         type_(type) {
   }
   virtual ~TabAnimation() {}
 
   Type type() const { return type_; }
 
   void Start() {
     animation_.SetSlideDuration(GetDuration());
-    animation_.SetTweenType(SlideAnimation::EASE_OUT);
+    animation_.SetTweenType(Tween::EASE_OUT);
     if (!animation_.IsShowing()) {
       animation_.Reset();
       animation_.Show();
     }
   }
 
   void Stop() {
     animation_.Stop();
   }
 
@@ skipping 1901 matching lines @@
 
   // Let the middle mouse button initiate clicks as well.
   gtk_util::SetButtonTriggersNavigation(button->widget());
   g_signal_connect(button->widget(), "clicked",
                    G_CALLBACK(OnNewTabClicked), this);
   GTK_WIDGET_UNSET_FLAGS(button->widget(), GTK_CAN_FOCUS);
   gtk_fixed_put(GTK_FIXED(tabstrip_.get()), button->widget(), 0, 0);
 
   return button;
 }