Deprecate StaleWhileRevalidateMetricsObserver

chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.cc
deleted file mode 100644
index 88012dae64b7b329227e807914cdd2c8314a7c70..0000000000000000000000000000000000000000
--- a/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.cc
+++ /dev/null
@@ -1,53 +0,0 @@
-// 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/stale_while_revalidate_metrics_observer.h"
-
-#include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
-#include "chrome/common/page_load_metrics/page_load_timing.h"
-#include "content/public/browser/navigation_handle.h"
-#include "net/base/stale_while_revalidate_experiment_domains.h"
-
-namespace chrome {
-
-StaleWhileRevalidateMetricsObserver::StaleWhileRevalidateMetricsObserver() {}
-
-page_load_metrics::PageLoadMetricsObserver::ObservePolicy
-StaleWhileRevalidateMetricsObserver::OnCommit(
-    content::NavigationHandle* navigation_handle) {
-  return net::IsHostInStaleWhileRevalidateExperimentDomain(
-             navigation_handle->GetURL().host())
-             ? CONTINUE_OBSERVING
-             : STOP_OBSERVING;
-}
-
-void StaleWhileRevalidateMetricsObserver::OnComplete(
-    const page_load_metrics::PageLoadTiming& timing,
-    const page_load_metrics::PageLoadExtraInfo& extra_info) {
-  using page_load_metrics::WasStartedInForegroundOptionalEventInForeground;
-
-  if (WasStartedInForegroundOptionalEventInForeground(timing.load_event_start,
-                                                      extra_info)) {
-    PAGE_LOAD_HISTOGRAM(
-        "PageLoad.Clients.StaleWhileRevalidateExperiment.Timing2."
-        "NavigationToLoadEventFired",
-        timing.load_event_start.value());
-  }
-  if (WasStartedInForegroundOptionalEventInForeground(timing.first_layout,
-                                                      extra_info)) {
-    PAGE_LOAD_HISTOGRAM(
-        "PageLoad.Clients.StaleWhileRevalidateExperiment.Timing2."
-        "NavigationToFirstLayout",
-        timing.first_layout.value());
-  }
-  if (WasStartedInForegroundOptionalEventInForeground(timing.first_text_paint,
-                                                      extra_info)) {
-    PAGE_LOAD_HISTOGRAM(
-        "PageLoad.Clients.StaleWhileRevalidateExperiment.Timing2."
-        "NavigationToFirstTextPaint",
-        timing.first_text_paint.value());
-  }
-}
-
-}  // namespace chrome