Deprecate StaleWhileRevalidateMetricsObserver

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
deleted file mode 100644
index 8dd3f4272ddbf5132237335823c7b353c2d22007..0000000000000000000000000000000000000000
--- a/chrome/browser/page_load_metrics/observers/stale_while_revalidate_metrics_observer.h
+++ /dev/null
@@ -1,29 +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.
-
-#ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_STALE_WHILE_REVALIDATE_METRICS_OBSERVER_H_
-#define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_STALE_WHILE_REVALIDATE_METRICS_OBSERVER_H_
-
-#include "base/macros.h"
-#include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
-
-namespace chrome {
-
-class StaleWhileRevalidateMetricsObserver
-    : public page_load_metrics::PageLoadMetricsObserver {
- public:
-  StaleWhileRevalidateMetricsObserver();
-  // page_load_metrics::PageLoadMetricsObserver implementation:
-  ObservePolicy OnCommit(content::NavigationHandle* navigation_handle) override;
-  void OnComplete(
-      const page_load_metrics::PageLoadTiming& timing,
-      const page_load_metrics::PageLoadExtraInfo& extra_info) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(StaleWhileRevalidateMetricsObserver);
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_STALE_WHILE_REVALIDATE_METRICS_OBSERVER_H_