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

chrome/test/base/testing_profile.h

Index: chrome/test/base/testing_profile.h
diff --git a/chrome/test/base/testing_profile.h b/chrome/test/base/testing_profile.h
index 9fff4af00ac8b145478fa519467cc24e8a58bf65..2384f0c602a94dd3adae1add3b7d2d512ff7d772 100644
--- a/chrome/test/base/testing_profile.h
+++ b/chrome/test/base/testing_profile.h
@@ -19,6 +19,10 @@
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "extensions/features/features.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/settings/scoped_cros_settings_test_helper.h"
+#endif
+
 class BrowserContextDependencyManager;
 class ExtensionSpecialStoragePolicy;
 class HostContentSettingsMap;
@@ -438,6 +442,11 @@ class TestingProfile : public Profile {
 
   std::string profile_name_;
 
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<chromeos::ScopedCrosSettingsTestHelper>
+      scoped_cros_settings_test_helper_;
+#endif  // defined(OS_CHROMEOS)
+
   std::unique_ptr<policy::PolicyService> policy_service_;
 };