PageLoadMetricsObservers observe individual page loads

chrome/browser/page_load_metrics/observers/google_captcha_observer.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/page_load_metrics/observers/google_captcha_observer.h"
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string_util.h"
 #include "components/page_load_metrics/browser/page_load_metrics_util.h"
 #include "components/page_load_metrics/common/page_load_timing.h"
@@ skipping 25 matching lines @@
 bool IsGoogleCaptcha(const GURL& url) {
   return (base::StartsWith(url.host(), "ipv4.google.",
                            base::CompareCase::SENSITIVE)
           || base::StartsWith(url.host(), "ipv6.google.",
                               base::CompareCase::SENSITIVE))
       && base::StartsWith(url.path(), "/sorry", base::CompareCase::SENSITIVE);
 }
 
 GoogleCaptchaObserver::GoogleCaptchaObserver(
     page_load_metrics::PageLoadMetricsObservable* metrics)
- : metrics_(metrics) {}
+    : PageLoadMetricsObserver(metrics) {}
 
 void GoogleCaptchaObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
   if (IsGoogleCaptcha(navigation_handle->GetURL()))
     RecordGoogleCaptchaEvent(GOOGLE_CAPTCHA_SHOWN);
 }
 
 void GoogleCaptchaObserver::OnRedirect(
     content::NavigationHandle* navigation_handle) {
   if (IsGoogleCaptcha(navigation_handle->GetReferrer().url))
     RecordGoogleCaptchaEvent(GOOGLE_CAPTCHA_SOLVED);
 }
 
-void GoogleCaptchaObserver::OnPageLoadMetricsGoingAway() {
-  metrics_->RemoveObserver(this);
-  delete this;
-}
-
 }  // namespace google_captcha_observer