Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/extensions/external_registry_loader_win.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.
 
 #include "chrome/browser/extensions/external_registry_loader_win.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_file.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "base/win/registry.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "components/crx_file/id_util.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 218 matching lines @@
   base::TimeTicks start_time = base::TimeTicks::Now();
   std::unique_ptr<base::DictionaryValue> prefs = LoadPrefsOnFileThread();
   LOCAL_HISTOGRAM_TIMES("Extensions.ExternalRegistryLoaderWinUpdate",
                         base::TimeTicks::Now() - start_time);
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                           base::Bind(&ExternalRegistryLoader::OnUpdated, this,
                                      base::Passed(&prefs)));
 }
 
 }  // namespace extensions