Remove #pragma once from chrome/browser/sync

chrome/browser/sync/test/integration/performance/sync_timing_helper.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_TEST_INTEGRATION_PERFORMANCE_SYNC_TIMING_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_PERFORMANCE_SYNC_TIMING_HELPER_H_
-#pragma once
 
 #include "base/basictypes.h"
 
 #include <string>
 #include <vector>
 
 namespace base {
 class TimeDelta;
 }
 
@@ skipping 22 matching lines @@
   // chrome/test/ui/ui_perf_test.{h,cc}.
   static void PrintResult(const std::string& measurement,
                           const std::string& trace,
                           const base::TimeDelta& dt);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncTimingHelper);
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_PERFORMANCE_SYNC_TIMING_HELPER_H_