[Page Load Metrics] Add mojom file to page load metrics.

chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
index 9b90abb1cabbe19aec8dffe280d364a93291a29d..39a4b2d6c96159624fdbace19f8b4f212bfe562e 100644
--- a/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.cc
@@ -141,7 +141,7 @@ AdsPageLoadMetricsObserver::OnDidFinishSubFrameNavigation(
 
 page_load_metrics::PageLoadMetricsObserver::ObservePolicy
 AdsPageLoadMetricsObserver::FlushMetricsOnAppEnterBackground(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& extra_info) {
   // The browser may come back, but there is no guarantee. To be safe, record
   // what we have now and ignore future changes to this navigation.
@@ -157,7 +157,7 @@ void AdsPageLoadMetricsObserver::OnLoadedResource(
 }
 
 void AdsPageLoadMetricsObserver::OnComplete(
-    const page_load_metrics::PageLoadTiming& timing,
+    const page_load_metrics::mojom::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   RecordHistograms();
 }