Refactor SetClientID such that metrics rather than crash backs up the client id in Google Update set

chrome/browser/metrics/chrome_metrics_service_client.cc

Index: chrome/browser/metrics/chrome_metrics_service_client.cc
diff --git a/chrome/browser/metrics/chrome_metrics_service_client.cc b/chrome/browser/metrics/chrome_metrics_service_client.cc
index 272e1719f6357756a39cb6ed8c99b85aa1fbe963..26caad8c328b9744c5df6f7ac23dfd74b58f5bcc 100644
--- a/chrome/browser/metrics/chrome_metrics_service_client.cc
+++ b/chrome/browser/metrics/chrome_metrics_service_client.cc
@@ -37,6 +37,7 @@
 #include "chrome/common/crash_keys.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
+#include "chrome/installer/util/google_update_settings.h"
 #include "components/metrics/metrics_service.h"
 #include "components/metrics/net/net_metrics_log_uploader.h"
 #include "content/public/browser/browser_thread.h"
@@ -160,8 +161,12 @@ void ChromeMetricsServiceClient::RegisterPrefs(PrefRegistrySimple* registry) {
 #endif  // defined(ENABLE_PLUGINS)
 }
 
-void ChromeMetricsServiceClient::SetClientID(const std::string& client_id) {
-  crash_keys::SetClientID(client_id);
+void ChromeMetricsServiceClient::RegisterClientID(
+    const std::string& client_id) {
+  crash_keys::SetClientIDFromGUID(client_id);
+
+  // Save a backup of the client id in Google Update settings.
+  GoogleUpdateSettings::SaveMetricsID(client_id);
 }
 
 bool ChromeMetricsServiceClient::IsOffTheRecordSessionActive() {