Split out MetricsServiceAccessor out of ChromeMetricsServiceAccessor.

chrome/browser/metrics/metrics_service_accessor.cc

Index: chrome/browser/metrics/metrics_service_accessor.cc
diff --git a/chrome/browser/metrics/metrics_service_accessor.cc b/chrome/browser/metrics/metrics_service_accessor.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6d73e580851e09d23c3d517bbe9ad54609e07610
--- /dev/null
+++ b/chrome/browser/metrics/metrics_service_accessor.cc
@@ -0,0 +1,24 @@
+// 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.
+
+#include "chrome/browser/metrics/metrics_service_accessor.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/metrics/metrics_service.h"
+#include "components/metrics/metrics_service_observer.h"
+
+// static
+void MetricsServiceAccessor::AddMetricsServiceObserver(
+    MetricsServiceObserver* observer) {
+  MetricsService* metrics_service = g_browser_process->metrics_service();
+  if (metrics_service)
+    metrics_service->AddObserver(observer);
+}
+
+void MetricsServiceAccessor::RemoveMetricsServiceObserver(
+    MetricsServiceObserver* observer) {
+  MetricsService* metrics_service = g_browser_process->metrics_service();
+  if (metrics_service)
+    metrics_service->RemoveObserver(observer);
+}