Add a regenerate button to regenerate the password in Windows.

rlz/win/lib/lib_mutex.h

Index: rlz/win/lib/lib_mutex.h
diff --git a/rlz/win/lib/lib_mutex.h b/rlz/win/lib/lib_mutex.h
deleted file mode 100644
index 6992bea2ed913ec055087fcdeb2663302c723997..0000000000000000000000000000000000000000
--- a/rlz/win/lib/lib_mutex.h
+++ /dev/null
@@ -1,28 +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.
-//
-// Mutex to guarantee serialization of RLZ key accesses.
-
-#ifndef RLZ_WIN_LIB_LIB_MUTEX_H_
-#define RLZ_WIN_LIB_LIB_MUTEX_H_
-
-#include <windows.h>
-
-namespace rlz_lib {
-
-class LibMutex {
- public:
-  LibMutex();
-  ~LibMutex();
-
-  bool failed(void) { return !acquired_; }
-
- private:
-  bool acquired_;
-  HANDLE mutex_;
-};
-
-}  // namespace rlz_lib
-
-#endif  // RLZ_WIN_LIB_LIB_MUTEX_H_