Attempt four at landing the "histogram.h removed from message_loop.h" patch.

chrome/browser/gtk/download_item_gtk.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/gtk/download_item_gtk.h"
 
 #include "app/gtk_util.h"
 #include "app/l10n_util.h"
 #include "app/menus/simple_menu_model.h"
 #include "app/resource_bundle.h"
 #include "app/slide_animation.h"
 #include "app/text_elider.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
+#include "base/histogram.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_shelf.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/gtk/custom_drag.h"
 #include "chrome/browser/gtk/download_shelf_gtk.h"
@@ skipping 830 matching lines @@
   get_download()->manager()->DangerousDownloadValidated(get_download());
 }
 
 void DownloadItemGtk::OnDangerousDecline(GtkWidget* button) {
   UMA_HISTOGRAM_LONG_TIMES("clickjacking.discard_download",
                            base::Time::Now() - creation_time_);
   if (get_download()->state() == DownloadItem::IN_PROGRESS)
     get_download()->Cancel(true);
   get_download()->Remove(true);
 }