Starting a refactor to allow adding metrics on upload.

chrome/browser/metrics/chrome_metrics_service_client.h

Index: chrome/browser/metrics/chrome_metrics_service_client.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.h b/chrome/browser/metrics/chrome_metrics_service_client.h
index 0ef629493e22d5045f54a00d5fcce73796783c58..b41914fa0b94ac5ba9af469f60a882bdfffeff68 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.h
+++ b/chrome/browser/metrics/chrome_metrics_service_client.h
@@ -168,12 +168,6 @@ class ChromeMetricsServiceClient
   GoogleUpdateMetricsProviderWin* google_update_metrics_provider_;
 #endif
 
-#if !defined(OS_CHROMEOS) && !defined(OS_IOS)
-  // The SigninStatusMetricsProvider instance that was registered with
-  // MetricsService. Has the same lifetime as |metrics_service_|.
-  SigninStatusMetricsProvider* signin_status_metrics_provider_;
-#endif
-
   // Callback that is called when initial metrics gathering is complete.
   base::Closure finished_gathering_initial_metrics_callback_;