Update OnCommit to return ObservePolicy.

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc

Index: chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc
diff --git a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc
index a493154bc861225c79ec650ff9af20d4b3847ebf..df210c62931ad811edced4f092811d4dd6f62cf2 100644
--- a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc
+++ b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer_unittest.cc
@@ -100,12 +100,13 @@ class TestDataReductionProxyMetricsObserver
   ~TestDataReductionProxyMetricsObserver() override {}
 
   // page_load_metrics::PageLoadMetricsObserver implementation:
-  void OnCommit(content::NavigationHandle* navigation_handle) override {
+  ObservePolicy OnCommit(
+      content::NavigationHandle* navigation_handle) override {
     DataReductionProxyData* data =
         DataForNavigationHandle(web_contents_, navigation_handle);
     data->set_used_data_reduction_proxy(data_reduction_proxy_used_);
     data->set_lofi_requested(lofi_used_);
-    DataReductionProxyMetricsObserver::OnCommit(navigation_handle);
+    return DataReductionProxyMetricsObserver::OnCommit(navigation_handle);
   }
 
   DataReductionProxyPingbackClient* GetPingbackClient() const override {