Remove the no-longer used TabButtonGtk class.

chrome/browser/gtk/tabs/tab_strip_gtk.cc

 // Copyright (c) 2009 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 "app/resource_bundle.h"
 #include "app/slide_animation.h"
 #include "base/gfx/gtk_util.h"
 #include "base/gfx/point.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/gtk/custom_button.h"
 #include "chrome/browser/gtk/tabs/dragged_tab_controller_gtk.h"
-#include "chrome/browser/gtk/tabs/tab_button_gtk.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/gfx/chrome_canvas.h"
 #include "chrome/common/l10n_util.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 
 namespace {
 
 const int kDefaultAnimationDurationMs = 100;
 const int kResizeLayoutAnimationDurationMs = 166;
@@ skipping 947 matching lines @@
 void TabStripGtk::FinishAnimation(TabStripGtk::TabAnimation* animation,
                                   bool layout) {
   active_animation_.reset(NULL);
   if (layout)
     Layout();
 }
 
 // static
 gboolean TabStripGtk::OnExpose(GtkWidget* widget, GdkEventExpose* event,
                                TabStripGtk* tabstrip) {
-
   if (gdk_region_empty(event->region))
     return TRUE;
 
   // TODO(jhawkins): Ideally we'd like to only draw what's needed in the damage
   // rect, but the tab widgets overlap each other, and painting on one widget
   // will cause an expose-event to be sent to the widgets underneath.  The
   // underlying widget does not need to be redrawn as we control the order of
   // expose-events.  Currently we hack it to redraw the entire tabstrip.  We
   // could change the damage rect to just contain the tabs + the new tab button.
   event->area.x = 0;
@@ skipping 82 matching lines @@
   CustomDrawButton* button = new CustomDrawButton(IDR_NEWTAB_BUTTON,
       IDR_NEWTAB_BUTTON_P, IDR_NEWTAB_BUTTON_H, 0);
 
   g_signal_connect(G_OBJECT(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;
 }