Refactor PageLoadExtraInfo::committed_url to url and did_commit fields.

chrome/browser/page_load_metrics/observers/ukm_page_load_metrics_observer.cc

 // Copyright 2017 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/ukm_page_load_metrics_observer.h"
 #include "chrome/browser/browser_process.h"
 #include "components/ukm/ukm_service.h"
 #include "components/ukm/ukm_source.h"
 
 // static
@@ skipping 32 matching lines @@
 
 void UkmPageLoadMetricsObserver::OnComplete(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
   SendMetricsToUkm(timing, info);
 }
 
 void UkmPageLoadMetricsObserver::SendMetricsToUkm(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
-  if (info.committed_url.is_empty() || !timing.first_contentful_paint)
+  if (!info.did_commit || !timing.first_contentful_paint)
     return;
 
   ukm::UkmService* ukm_service = g_browser_process->ukm_service();
   DCHECK(ukm_service);
 
   std::unique_ptr<ukm::UkmSource> source = base::MakeUnique<ukm::UkmSource>();
-  source->set_committed_url(info.committed_url);
+  source->set_committed_url(info.url);
   source->set_first_contentful_paint(timing.first_contentful_paint.value());
 
   ukm_service->RecordSource(std::move(source));
 }