Refactor ScopedCommandLineSwitch

extensions/common/test/scoped_command_line_switch.h

+// Copyright 2015 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 EXTENSIONS_COMMON_TEST_SCOPED_COMMAND_LINE_SWITCH_H_
+#define EXTENSIONS_COMMON_TEST_SCOPED_COMMAND_LINE_SWITCH_H_
+
+#include <string>
+
+#include "base/command_line.h"
+
+class ScopedCommandLineSwitch {
+ public:
+  explicit ScopedCommandLineSwitch(const std::string& switch_string);
+  ScopedCommandLineSwitch(const std::string& switch_string,
+                          const std::string& value);
+  ~ScopedCommandLineSwitch();
+
+ private:
+  base::CommandLine original_command_line_;
+};
+
+#endif  // EXTENSIONS_COMMON_TEST_SCOPED_COMMAND_LINE_SWITCH_H_