Gtk: Change NULL to nullptr

chrome/browser/ui/libgtkui/app_indicator_icon_menu.cc

 // Copyright 2014 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/libgtkui/app_indicator_icon_menu.h"
 
 #include <gtk/gtk.h>
 
 #include "base/bind.h"
 #include "base/debug/leak_annotations.h"
 #include "chrome/browser/ui/libgtkui/menu_util.h"
 #include "ui/base/models/menu_model.h"
 
 namespace libgtkui {
 
 AppIndicatorIconMenu::AppIndicatorIconMenu(ui::MenuModel* model)
     : menu_model_(model),
       click_action_replacement_menu_item_added_(false),
-      gtk_menu_(NULL),
+      gtk_menu_(nullptr),
       block_activation_(false) {
   {
     ANNOTATE_SCOPED_MEMORY_LEAK; // http://crbug.com/378770
     gtk_menu_ = gtk_menu_new();
   }
   g_object_ref_sink(gtk_menu_);
   if (menu_model_) {
     BuildSubmenuFromModel(menu_model_,
                           gtk_menu_,
                           G_CALLBACK(OnMenuItemActivatedThunk),
@@ skipping 10 matching lines @@
 
 void AppIndicatorIconMenu::UpdateClickActionReplacementMenuItem(
     const char* label,
     const base::Closure& callback) {
   click_action_replacement_callback_ = callback;
 
   if (click_action_replacement_menu_item_added_) {
     GList* children = gtk_container_get_children(GTK_CONTAINER(gtk_menu_));
     for (GList* child = children; child; child = g_list_next(child)) {
       if (g_object_get_data(G_OBJECT(child->data), "click-action-item") !=
-          NULL) {
+          nullptr) {
         gtk_menu_item_set_label(GTK_MENU_ITEM(child->data), label);
         break;
       }
     }
     g_list_free(children);
   } else {
     click_action_replacement_menu_item_added_ = true;
 
     // If |menu_model_| is non empty, add a separator to separate the
     // "click action replacement menu item" from the other menu items.
@@ skipping 53 matching lines @@
   int id;
   if (!GetMenuItemID(menu_item, &id))
     return;
 
   // The menu item can still be activated by hotkeys even if it is disabled.
   if (menu_model_->IsEnabledAt(id))
     ExecuteCommand(model, id);
 }
 
 }  // namespace libgtkui