Render the tab close button as a vector-based icon.

chrome/browser/ui/views/tabs/tab_strip.cc

 // Copyright (c) 2012 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/ui/views/tabs/tab_strip.h"
 
 #if defined(OS_WIN)
 #include <windowsx.h>
 #endif
 
@@ skipping 1513 matching lines @@
   if (drop_indicator_width == 0) {
     // Direction doesn't matter, both images are the same size.
     gfx::ImageSkia* drop_image = GetDropArrowImage(true);
     drop_indicator_width = drop_image->width();
     drop_indicator_height = drop_image->height();
   }
 }
 
 Tab* TabStrip::CreateTab() {
   Tab* tab = new Tab(this);
-  tab->set_animation_container(animation_container_.get());
+  tab->SetAnimationContainer(animation_container_.get());
   return tab;
 }
 
 void TabStrip::StartInsertTabAnimation(int model_index) {
   PrepareForAnimation();
 
   // The TabStrip can now use its entire width to lay out Tabs.
   in_tab_close_ = false;
   available_width_for_tabs_ = -1;
 
@@ skipping 1225 matching lines @@
           ConvertPointToViewAndGetEventHandler(this, newtab_button_, point);
       if (view)
         return view;
     }
     Tab* tab = FindTabForEvent(point);
     if (tab)
       return ConvertPointToViewAndGetEventHandler(this, tab, point);
   }
   return this;
 }