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

chrome/browser/ui/user_data_dir_dialog.h

Index: chrome/browser/ui/user_data_dir_dialog.h
diff --git a/chrome/browser/ui/user_data_dir_dialog.h b/chrome/browser/ui/user_data_dir_dialog.h
deleted file mode 100644
index eb8418ed79247fdba7946267eafb5fed58fae357..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/user_data_dir_dialog.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_UI_USER_DATA_DIR_DIALOG_H_
-#define CHROME_BROWSER_UI_USER_DATA_DIR_DIALOG_H_
-
-namespace base {
-class FilePath;
-}
-
-namespace chrome {
-
-// Shows a user data directory picker dialog. The method blocks while the dialog
-// is showing. If the user picks a directory, this method returns the chosen
-// directory. |user_data_dir| is the value of the directory we were not able to
-// use.
-base::FilePath ShowUserDataDirDialog(const base::FilePath& user_data_dir);
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_UI_USER_DATA_DIR_DIALOG_H_