Componentize SafeBrowsingBlockingPage for WebView use

components/security_interstitials/core/metrics_helper.cc

Index: components/security_interstitials/core/metrics_helper.cc
diff --git a/components/security_interstitials/core/metrics_helper.cc b/components/security_interstitials/core/metrics_helper.cc
index 2b9f51cf1c0d0c48833e12d90fa9d4ba4d74ccb0..5a061fca4c1ead5d1155318371193ee94b3975b6 100644
--- a/components/security_interstitials/core/metrics_helper.cc
+++ b/components/security_interstitials/core/metrics_helper.cc
@@ -167,6 +167,13 @@ int MetricsHelper::NumVisits() {
   return num_visits_;
 }
 
+void MetricsHelper::RecordExtraUserDecisionMetrics(Decision decision) {}
+
+void MetricsHelper::RecordExtraUserInteractionMetrics(Interaction interaction) {
+}
+
+void MetricsHelper::RecordExtraShutdownMetrics() {}
+
 void MetricsHelper::OnGotHistoryCount(bool success,
                                       int num_visits,
                                       base::Time /*first_visit*/) {