Remove MetricsServiceObserver in favor of MetricsProvider.

chrome/browser/chrome_browser_metrics_service_observer.h

Index: chrome/browser/chrome_browser_metrics_service_observer.h
diff --git a/chrome/browser/chrome_browser_metrics_service_observer.h b/chrome/browser/chrome_browser_metrics_service_observer.h
deleted file mode 100644
index d8e20da077ca837513b7b6d36f3dd3a32ec389f9..0000000000000000000000000000000000000000
--- a/chrome/browser/chrome_browser_metrics_service_observer.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright 2014 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_CHROME_BROWSER_METRICS_SERVICE_OBSERVER_H_
-#define CHROME_BROWSER_CHROME_BROWSER_METRICS_SERVICE_OBSERVER_H_
-
-#include "components/metrics/metrics_service_observer.h"
-
-// ChromeBrowserMetricsServiceObserver receives notifications when the metrics
-// service creates a new metrics log.
-class ChromeBrowserMetricsServiceObserver
-    : public metrics::MetricsServiceObserver {
- public:
-  ChromeBrowserMetricsServiceObserver();
-  virtual ~ChromeBrowserMetricsServiceObserver();
-
-  // MetricsServiceObserver:
-  virtual void OnDidCreateMetricsLog() OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMetricsServiceObserver);
-};
-
-#endif  // CHROME_BROWSER_CHROME_BROWSER_METRICS_SERVICE_OBSERVER_H_