Various cleanups for page_load_metrics_browsertest

chrome/browser/page_load_metrics/metrics_web_contents_observer.h

Index: chrome/browser/page_load_metrics/metrics_web_contents_observer.h
diff --git a/chrome/browser/page_load_metrics/metrics_web_contents_observer.h b/chrome/browser/page_load_metrics/metrics_web_contents_observer.h
index 07c14bf90d3cb8e4a77c0e05df430983f6c46644..2735b4a95f378949fa7cef532081b44afc3832e8 100644
--- a/chrome/browser/page_load_metrics/metrics_web_contents_observer.h
+++ b/chrome/browser/page_load_metrics/metrics_web_contents_observer.h
@@ -56,7 +56,8 @@ class MetricsWebContentsObserver
     void OnGoingAway();
 
     // Invoked when a new PageLoadTiming update has been received and processed.
-    virtual void OnTimingUpdated(const PageLoadTiming& timing,
+    virtual void OnTimingUpdated(bool is_main_frame,
+                                 const PageLoadTiming& timing,
                                  const PageLoadMetadata& metadata) {}
 
    private: