MD Settings: implement "RESTART" button for hardware acceleration to take effect

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 d7ae6822640499b404e4b973e9897b7be2d1de17..8033214949a15598323de5483204190151270b79 100644
--- a/chrome/browser/metrics/chrome_metrics_service_accessor.h
+++ b/chrome/browser/metrics/chrome_metrics_service_accessor.h
@@ -56,6 +56,10 @@ class SafeBrowsingUIManager;
 class SRTFetcher;
 }
 
+namespace settings {
+class SystemHandler;
+}
+
 namespace speech {
 class ChromeSpeechRecognitionManagerDelegate;
 }
@@ -94,6 +98,7 @@ class ChromeMetricsServiceAccessor : public metrics::MetricsServiceAccessor {
   friend class safe_browsing::DownloadSBClient;
   friend class safe_browsing::SafeBrowsingService;
   friend class safe_browsing::SafeBrowsingUIManager;
+  friend class settings::SystemHandler;
 
   FRIEND_TEST_ALL_PREFIXES(ChromeMetricsServiceAccessorTest,
                            MetricsReportingEnabled);