Replace ScopedCommandLineOverride with TestSuite listener.

chrome/test/base/scoped_command_line_override.h

-// Copyright (c) 2011 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_TEST_BASE_SCOPED_COMMAND_LINE_OVERRIDE_H_
-#define CHROME_TEST_BASE_SCOPED_COMMAND_LINE_OVERRIDE_H_
-#pragma once
-
-#include <string>
-
-#include "base/command_line.h"
-
-// ScopedCommandLineOverride takes the CommandLine for the current
-// process, saves it, then alters it. When the instance of this class
-// goes out of scope, it restores CommandLine to its prior state. The
-// intended usage is to test something that requires a flag that's off
-// by default:
-//
-// ASSERT_TRUE(!Something::NotFullyBaked());
-// {
-//   ScopedCommandLineOverride override(switches:kEnableSomethingHalfBaked);
-//   ASSERT_TRUE(Something::NotFullyBaked());
-// }
-class ScopedCommandLineOverride {
- public:
-  explicit ScopedCommandLineOverride(const std::string& new_switch);
-  virtual ~ScopedCommandLineOverride();
- private:
-  CommandLine old_command_line_;
-};
-
-#endif  // CHROME_TEST_BASE_SCOPED_COMMAND_LINE_OVERRIDE_H_