Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/download/download_history.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.
 
 // DownloadHistory manages persisting DownloadItems to the history service by
 // observing a single DownloadManager and all its DownloadItems using an
 // AllDownloadItemNotifier.
 //
 // DownloadHistory decides whether and when to add items to, remove items from,
 // and update items in the database. DownloadHistory uses DownloadHistoryData to
@@ skipping 13 matching lines @@
 // DownloadHistory to prevent use-after-free bugs.
 // ChromeDownloadManagerDelegate owns DownloadHistory, and deletes it in
 // Shutdown(), which is called by DownloadManagerImpl::Shutdown() after all
 // DownloadItems are destroyed.
 
 #include "chrome/browser/download/download_history.h"
 
 #include <utility>
 
 #include "base/macros.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "components/history/content/browser/download_constants_utils.h"
 #include "components/history/core/browser/download_database.h"
 #include "components/history/core/browser/download_row.h"
 #include "components/history/core/browser/history_service.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 
 #if defined(ENABLE_EXTENSIONS)
@@ skipping 415 matching lines @@
   removing_ids_.insert(download_id);
 }
 
 void DownloadHistory::RemoveDownloadsBatch() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   IdSet remove_ids;
   removing_ids_.swap(remove_ids);
   history_->RemoveDownloads(remove_ids);
   FOR_EACH_OBSERVER(Observer, observers_, OnDownloadsRemoved(remove_ids));
 }