[CleanUp] Use base::STLSetDifference in place of std::set_difference

chrome/browser/ui/gtk/tabs/tab_strip_gtk.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/gtk/tabs/tab_strip_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1074 matching lines @@
       model_->selection_model().selected_indices().end(),
       it1);
   for (std::vector<int>::iterator it = indices_affected.begin();
        it != indices_affected.end(); ++it) {
     // SchedulePaint() has already been called for the active tab and
     // the previously active tab (if it still exists).
     if (*it != model_->active_index() && *it != old_model.active())
       GetTabAtAdjustForAnimation(*it)->SchedulePaint();
   }
 
-  ui::ListSelectionModel::SelectedIndices no_longer_selected;
-  std::insert_iterator<std::vector<int> > it2(no_longer_selected,
-                                              no_longer_selected.begin());
-  std::set_difference(old_model.selected_indices().begin(),
-                      old_model.selected_indices().end(),
-                      model_->selection_model().selected_indices().begin(),
-                      model_->selection_model().selected_indices().end(),
-                      it2);
+  ui::ListSelectionModel::SelectedIndices no_longer_selected =
+      base::STLSetDifference<ui::ListSelectionModel::SelectedIndices>(
+          old_model.selected_indices(),
+          model_->selection_model().selected_indices());
   for (std::vector<int>::iterator it = no_longer_selected.begin();
        it != no_longer_selected.end(); ++it) {
     GetTabAtAdjustForAnimation(*it)->StopMiniTabTitleAnimation();
   }
 }
 
 void TabStripGtk::TabMoved(WebContents* contents,
                            int from_index,
                            int to_index) {
   gfx::Rect start_bounds = GetIdealBounds(from_index);
@@ skipping 1159 matching lines @@
 
 void TabStripGtk::SetNewTabButtonBackground() {
   SkColor color = theme_service_->GetColor(
       ThemeProperties::COLOR_BUTTON_BACKGROUND);
   SkBitmap background = theme_service_->GetImageNamed(
       IDR_THEME_WINDOW_CONTROL_BACKGROUND).AsBitmap();
   SkBitmap mask = theme_service_->GetImageNamed(
       IDR_NEWTAB_BUTTON_MASK).AsBitmap();
   newtab_button_->SetBackground(color, background, mask);
 }