Revert 167808 - Get rid of use of CreateStringValue in chromeos/ directory.

chrome/browser/chromeos/settings/system_settings_provider.cc

Index: chrome/browser/chromeos/settings/system_settings_provider.cc
===================================================================
--- chrome/browser/chromeos/settings/system_settings_provider.cc	(revision 167824)
+++ chrome/browser/chromeos/settings/system_settings_provider.cc	(working copy)
@@ -21,7 +21,7 @@
   system::TimezoneSettings *timezone_settings =
       system::TimezoneSettings::GetInstance();
   timezone_settings->AddObserver(this);
-  timezone_value_.reset(new base::StringValue(
+  timezone_value_.reset(base::Value::CreateStringValue(
       timezone_settings->GetCurrentTimezoneID()));
 }
 
@@ -62,7 +62,7 @@
 
 void SystemSettingsProvider::TimezoneChanged(const icu::TimeZone& timezone) {
   // Fires system setting change notification.
-  timezone_value_.reset(new base::StringValue(
+  timezone_value_.reset(base::Value::CreateStringValue(
       system::TimezoneSettings::GetTimezoneID(timezone)));
   NotifyObservers(kSystemTimezone);
 }