PageLoadMetricsObservers observe individual page loads

chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h b/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h
index d60aeb9bee6d17d769f04661d2677c1bc8493d5b..19fb1882c71071a92f8e3626f1c267809693f9f3 100644
--- a/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h
@@ -13,20 +13,17 @@ namespace chrome {
 class StaleWhileRevalidateMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
-  explicit StaleWhileRevalidateMetricsObserver(
-      page_load_metrics::PageLoadMetricsObservable* metrics);
+  StaleWhileRevalidateMetricsObserver();
   // page_load_metrics::PageLoadMetricsObserver implementation:
   void OnCommit(content::NavigationHandle* navigation_handle) override;
   void OnComplete(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
-  void OnPageLoadMetricsGoingAway() override;
 
  private:
   // True if the committed URL is one of the domains of interest to the
   // stale-while-revalidate experiment.
   bool is_interesting_domain_;
-  page_load_metrics::PageLoadMetricsObservable* const metrics_;
 
   DISALLOW_COPY_AND_ASSIGN(StaleWhileRevalidateMetricsObserver);
 };