GTK: Compile fix for Natty in history menu code

chrome/browser/ui/gtk/global_history_menu.cc

 // Copyright (c) 2011 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/global_history_menu.h"
 
 #include <gtk/gtk.h>
 
 #include "base/stl_util-inl.h"
 #include "base/utf_string_conversions.h"
@@ skipping 204 matching lines @@
   item->icon_requested = true;
 }
 
 void GlobalHistoryMenu::GotFaviconData(FaviconService::Handle handle,
                                        history::FaviconData favicon) {
   HistoryItem* item =
       favicon_consumer_.GetClientData(
           profile_->GetFaviconService(Profile::EXPLICIT_ACCESS), handle);
   DCHECK(item);
   item->icon_requested = false;
-  item->icon_handle = NULL;
+  item->icon_handle = static_cast<CancelableRequestProvider::Handle>(NULL);
 
   SkBitmap icon;
   if (favicon.is_valid() &&
       gfx::PNGCodec::Decode(favicon.image_data->front(),
                             favicon.image_data->size(), &icon)) {
     GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(&icon);
     if (pixbuf) {
       item->icon_image.Own(gtk_image_new_from_pixbuf(pixbuf));
       g_object_unref(pixbuf);
 
       if (item->menu_item) {
         gtk_image_menu_item_set_image(
             GTK_IMAGE_MENU_ITEM(item->menu_item),
             item->icon_image.get());
       }
     }
   }
 }
 
 void GlobalHistoryMenu::CancelFaviconRequest(HistoryItem* item) {
   DCHECK(item);
   if (item->icon_requested) {
     FaviconService* service =
         profile_->GetFaviconService(Profile::EXPLICIT_ACCESS);
     service->CancelRequest(item->icon_handle);
     item->icon_requested = false;
-    item->icon_handle = NULL;
+    item->icon_handle = static_cast<CancelableRequestProvider::Handle>(NULL);
   }
 }
 
 int GlobalHistoryMenu::GetIndexOfMenuItemWithTag(GtkWidget* menu, int tag_id) {
   GetIndexClosure closure;
   closure.found = false;
   closure.current_index = 0;
   closure.tag = tag_id;
 
   gtk_container_foreach(
@@ skipping 190 matching lines @@
   TabRestoreService* service = browser_->profile()->GetTabRestoreService();
   if (item->session_id && service) {
     service->RestoreEntryById(browser_->tab_restore_service_delegate(),
                               item->session_id, false);
   } else {
     DCHECK(item->url.is_valid());
     browser_->OpenURL(item->url, GURL(), disposition,
                       PageTransition::AUTO_BOOKMARK);
   }
 }