Revert of Remove unneeded Friend from chrome_metrics_service_accessor

chrome/browser/metrics/chrome_metrics_service_accessor.h

Index: chrome/browser/metrics/chrome_metrics_service_accessor.h
diff --git a/chrome/browser/metrics/chrome_metrics_service_accessor.h b/chrome/browser/metrics/chrome_metrics_service_accessor.h
index a0af99423e8ff114e2a15c52d08cd2013e7f0996..975765b9aa5ed01aa316e1dcb00ff9b9798c9e4d 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.h
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.h
@@ -14,11 +14,18 @@
 #include "chrome/browser/metrics/metrics_service_accessor.h"
 
 class ChromeExtensionDownloaderFactory;
+class PrefService;
 class Profile;
 
 namespace {
 class CrashesDOMHandler;
 class FlashDOMHandler;
+}
+
+namespace component_updater {
+class ComponentUpdateService;
+void RegisterSwReporterComponent(ComponentUpdateService* cus,
+                                 PrefService* prefs);
 }
 
 namespace extensions {
@@ -42,6 +49,9 @@
 // as a 'friend' below.
 class ChromeMetricsServiceAccessor : public MetricsServiceAccessor {
  private:
+  friend void component_updater::RegisterSwReporterComponent(
+      component_updater::ComponentUpdateService* cus,
+      PrefService* prefs);
   friend bool prerender::IsOmniboxEnabled(Profile* profile);
   friend class ChromeExtensionDownloaderFactory;
   friend class ChromeRenderMessageFilter;