Refactor ScopedCommandLineSwitch

extensions/common/test/scoped_command_line_switch.cc

+// 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.
+
+#include "extensions/common/test/scoped_command_line_switch.h"
+
+ScopedCommandLineSwitch::ScopedCommandLineSwitch(
+    const std::string& switch_string)
+    : original_command_line_(*base::CommandLine::ForCurrentProcess()) {
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(switch_string);
+}
+
+ScopedCommandLineSwitch::ScopedCommandLineSwitch(
+    const std::string& switch_string,
+    const std::string& value)
+    : original_command_line_(*base::CommandLine::ForCurrentProcess()) {
+  base::CommandLine::ForCurrentProcess()->AppendSwitchASCII(switch_string,
+                                                            value);
+}
+
+ScopedCommandLineSwitch::~ScopedCommandLineSwitch() {
+  *base::CommandLine::ForCurrentProcess() = original_command_line_;
+}