Reland r52336.

chrome/browser/sessions/session_service.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 "build/build_config.h"
 
 #include "chrome/browser/sessions/session_service.h"
 
 #include <limits>
 
 #include "base/callback.h"
 #include "base/file_util.h"
+#include "base/histogram.h"
 #include "base/message_loop.h"
 #include "base/pickle.h"
 #include "base/scoped_vector.h"
 #include "base/thread.h"
 #include "chrome/browser/browser_init.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browser_window.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/profile.h"
@@ skipping 1439 matching lines @@
   if (use_long_period) {
     std::string long_name_("SessionRestore.SaveLongPeriod");
     UMA_HISTOGRAM_CUSTOM_TIMES(long_name_,
         delta,
         save_delay_in_mins_,
         save_delay_in_hrs_,
         50);
   }
 }