[Metrics] Move MetricsServiceObserver into //components/metrics

components/metrics/metrics_service_observer.cc

Index: components/metrics/metrics_service_observer.cc
diff --git a/chrome/browser/metrics/metrics_service_observer.cc b/components/metrics/metrics_service_observer.cc
similarity index 80%
rename from chrome/browser/metrics/metrics_service_observer.cc
rename to components/metrics/metrics_service_observer.cc
index 754c10f14289bc6e2cb23582fca19a1b5c4c91a0..576ca3b355bddc95262815096b5f77b34c1bd479 100644
--- a/chrome/browser/metrics/metrics_service_observer.cc
+++ b/components/metrics/metrics_service_observer.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/chrome_browser_metrics_service_observer.h"
+#include "components/metrics/metrics_service_observer.h"
 
 MetricsServiceObserver::MetricsServiceObserver() {
 }