Attemp 2 at:

chrome/browser/views/tabs/tab_strip.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/views/tabs/tab_strip.h"
 
 #include "app/animation_container.h"
 #include "app/drag_drop_types.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 111 matching lines @@
 const int TabStrip::mini_to_non_mini_gap_ = 3;
 
 TabStrip::TabStrip(TabStripController* controller)
     : BaseTabStrip(controller, BaseTabStrip::HORIZONTAL_TAB_STRIP),
       resize_layout_factory_(this),
       added_as_message_loop_observer_(false),
       current_unselected_width_(Tab::GetStandardSize().width()),
       current_selected_width_(Tab::GetStandardSize().width()),
       available_width_for_tabs_(-1),
       in_tab_close_(false),
-      animation_container_(new AnimationContainer()),
-      new_tab_button_enabled_(true) {
+      animation_container_(new AnimationContainer()) {
   Init();
 }
 
 TabStrip::~TabStrip() {
   // The animations may reference the tabs. Shut down the animation before we
   // delete the tabs.
   StopAnimating(false);
 
   DestroyDragController();
 
@@ skipping 224 matching lines @@
       }
     }
   }
 
   return View::GetViewByID(view_id);
 }
 
 void TabStrip::Layout() {
   BaseTabStrip::Layout();
 
-  if (new_tab_button_enabled_) {
-    newtab_button_->SetBounds(newtab_button_bounds_);
-    newtab_button_->SetVisible(true);
-  } else {
-    newtab_button_->SetVisible(false);
-  }
+  newtab_button_->SetBounds(newtab_button_bounds_);
+
+  SchedulePaint();
 }
 
 gfx::Size TabStrip::GetPreferredSize() {
   return gfx::Size(0, Tab::GetMinimumUnselectedSize().height());
 }
 
 void TabStrip::OnDragEntered(const DropTargetEvent& event) {
   // Force animations to stop, otherwise it makes the index calculation tricky.
   StopAnimating(true);
 
@@ skipping 734 matching lines @@
   }
 }
 
 bool TabStrip::HasPhantomTabs() const {
   for (int i = 0; i < tab_count(); ++i) {
     if (GetTabAtTabDataIndex(i)->data().phantom)
       return true;
   }
   return false;
 }