ChromeOS: Per-user time zone: refactor tests first.

chrome/browser/chromeos/scoped_set_running_on_chromeos_for_testing.cc

+// Copyright 2017 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 "chrome/browser/chromeos/scoped_set_running_on_chromeos_for_testing.h"
+
+#include "base/sys_info.h"
+
+namespace chromeos {
+
+ScopedSetRunningOnChromeOSForTesting::ScopedSetRunningOnChromeOSForTesting(
+    const std::string& lsb_release,
+    const base::Time& lsb_release_time) {
+  base::SysInfo::SetChromeOSVersionInfoForTest(lsb_release, lsb_release_time);
+}
+
+ScopedSetRunningOnChromeOSForTesting::~ScopedSetRunningOnChromeOSForTesting() {
+  base::SysInfo::SetChromeOSVersionInfoForTest("", base::Time());
+}
+
+}  // namespace chromeos