Revert 202620 "Collect tab timing information for use in telemen..."

trunk/src/content/renderer/stats_collection_observer.h

-// Copyright 2013 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 CONTENT_RENDERER_STATS_COLLECTION_OBSERVER_H_
-#define CONTENT_RENDERER_STATS_COLLECTION_OBSERVER_H_
-
-#include "base/time.h"
-#include "content/public/renderer/render_view_observer.h"
-
-namespace content {
-
-class RenderViewImpl;
-
-// Collect timing information for page loads.
-// If a Renderview performs multiple loads, only the first one is recorded.
-class StatsCollectionObserver : public RenderViewObserver {
- public:
-  explicit StatsCollectionObserver(RenderViewImpl* render_view);
-  virtual ~StatsCollectionObserver();
-
-  // RenderViewObserver implementation
-  virtual void DidStartLoading() OVERRIDE;
-  virtual void DidStopLoading() OVERRIDE;
-
-  // Timing for the page load start and stop.  These functions may return
-  // a null time value under various circumstances.
-  const base::TimeTicks& load_start_time() { return start_time_; }
-  const base::TimeTicks& load_stop_time() { return stop_time_; }
-
- private:
-  base::TimeTicks start_time_;
-  base::TimeTicks stop_time_;
-
-   DISALLOW_COPY_AND_ASSIGN(StatsCollectionObserver);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_STATS_COLLECTION_OBSERVER_H_