Use a direct include of strings headers in chrome/browser/extensions/, part 4.

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/file_util.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_handle.h"
 #include "base/metrics/histogram.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "base/win/registry.h"
 #include "chrome/browser/extensions/external_provider_impl.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
@@ skipping 126 matching lines @@
 
   prefs_.reset(prefs.release());
   HISTOGRAM_TIMES("Extensions.ExternalRegistryLoaderWin",
                   base::TimeTicks::Now() - start_time);
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&ExternalRegistryLoader::LoadFinished, this));
 }
 
 }  // namespace extensions