Revise user-data-dir switch handling; avoid crashes.

chrome/browser/user_data_dir_extractor_win.h

Index: chrome/browser/user_data_dir_extractor_win.h
diff --git a/chrome/browser/user_data_dir_extractor_win.h b/chrome/browser/user_data_dir_extractor_win.h
deleted file mode 100644
index bff11a7b475a17d00aaf7aa0184deb4af10d184a..0000000000000000000000000000000000000000
--- a/chrome/browser/user_data_dir_extractor_win.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2013 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_USER_DATA_DIR_EXTRACTOR_WIN_H_
-#define CHROME_BROWSER_USER_DATA_DIR_EXTRACTOR_WIN_H_
-
-#include "base/callback.h"
-#include "base/files/file_path.h"
-
-namespace chrome {
-
-typedef base::Callback<base::FilePath()> GetUserDataDirCallback;
-
-// Tests can call this to install a custom callback to be called when
-// GetUserDataDir() is invoked.
-void InstallCustomGetUserDataDirCallbackForTest(
-    GetUserDataDirCallback* callback);
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_USER_DATA_DIR_EXTRACTOR_WIN_H_