CrOS settings/metrics: Correctly store Subscriptions

chrome/browser/metrics/chrome_metrics_services_manager_client.h

Index: chrome/browser/metrics/chrome_metrics_services_manager_client.h
diff --git a/chrome/browser/metrics/chrome_metrics_services_manager_client.h b/chrome/browser/metrics/chrome_metrics_services_manager_client.h
index 7d268e720b85e3b79030f9b2f2f3c57c727e9406..619d97cdaf23cc7c863b8f47c0944a00447c125e 100644
--- a/chrome/browser/metrics/chrome_metrics_services_manager_client.h
+++ b/chrome/browser/metrics/chrome_metrics_services_manager_client.h
@@ -13,6 +13,10 @@
 #include "base/threading/thread_checker.h"
 #include "components/metrics_services_manager/metrics_services_manager_client.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/settings/cros_settings.h"
+#endif
+
 class PrefService;
 
 namespace metrics {
@@ -92,6 +96,11 @@ class ChromeMetricsServicesManagerClient
   // Weak pointer to the local state prefs store.
   PrefService* local_state_;
 
+#if defined(OS_CHROMEOS)
+  std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
+      cros_settings_observer_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(ChromeMetricsServicesManagerClient);
 };