Extract the handling of the clean exit beacon from MetricsService. The extracted implementation sup…

components/metrics/metrics_service_client.cc

Index: components/metrics/metrics_service_client.cc
diff --git a/components/metrics/client_info.cc b/components/metrics/metrics_service_client.cc
similarity index 58%
copy from components/metrics/client_info.cc
copy to components/metrics/metrics_service_client.cc
index 57ad3947c1bd6b736b3acd2b3b15e20454f9f135..adc3e34afb66462b27569cb800ae2266e01a2482 100644
--- a/components/metrics/client_info.cc
+++ b/components/metrics/metrics_service_client.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/metrics/client_info.h"
+#include "components/metrics/metrics_service_client.h"
 
 namespace metrics {
 
-ClientInfo::ClientInfo() : installation_date(0), reporting_enabled_date(0) {}
-
-ClientInfo::~ClientInfo() {}
+base::string16 MetricsServiceClient::GetRegistryBackupKey() {
+  return base::string16();
+}
 
 }  // namespace metrics