Update OnCommit to return ObservePolicy.

chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc
index 2e15f0603ce12fa0dfbe68dbb41eb91432ed465c..f7c44b2e982748fc9d2ca398e748c3351ab788bc 100644
--- a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.cc
@@ -214,7 +214,8 @@ CorePageLoadMetricsObserver::CorePageLoadMetricsObserver()
 
 CorePageLoadMetricsObserver::~CorePageLoadMetricsObserver() {}
 
-void CorePageLoadMetricsObserver::OnCommit(
+page_load_metrics::PageLoadMetricsObserver::ObservePolicy
+CorePageLoadMetricsObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
   transition_ = navigation_handle->GetPageTransition();
   initiated_by_user_gesture_ = navigation_handle->HasUserGesture();
@@ -225,6 +226,7 @@ void CorePageLoadMetricsObserver::OnCommit(
     was_no_store_main_resource_ =
         headers->HasHeaderValue("cache-control", "no-store");
   }
+  return CONTINUE_OBSERVING;
 }
 
 void CorePageLoadMetricsObserver::OnDomContentLoadedEventStart(