PageLoadMetricsObservers observe individual page loads

chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
index da8046aa770ac281e62ba05efefc51798d0168ef..bccbd593e75d4b8e70201cf7569fb5c68cd7c56b 100644
--- a/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.cc
@@ -57,9 +57,8 @@ bool ShouldLogEvent(const base::TimeDelta& event,
 
 }  // namespace
 
-FromGWSPageLoadMetricsObserver::FromGWSPageLoadMetricsObserver(
-    page_load_metrics::PageLoadMetricsObservable* metrics)
-    : navigation_from_gws_(false), metrics_(metrics) {}
+FromGWSPageLoadMetricsObserver::FromGWSPageLoadMetricsObserver()
+    : navigation_from_gws_(false) {}
 
 void FromGWSPageLoadMetricsObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
@@ -116,11 +115,6 @@ void FromGWSPageLoadMetricsObserver::OnComplete(
   }
 }
 
-void FromGWSPageLoadMetricsObserver::OnPageLoadMetricsGoingAway() {
-  metrics_->RemoveObserver(this);
-  delete this;
-}
-
 void FromGWSPageLoadMetricsObserver::SetCommittedURLAndReferrer(
     const GURL& url,
     const content::Referrer& referrer) {