Set a "metrics_client_id" crash key instead of "guid" on Mac OS X

chromecast/browser/metrics/cast_metrics_service_client.cc

Index: chromecast/browser/metrics/cast_metrics_service_client.cc
diff --git a/chromecast/browser/metrics/cast_metrics_service_client.cc b/chromecast/browser/metrics/cast_metrics_service_client.cc
index 48bf45bbfd2e70210c2a7f9bf800ee86e59fba9f..a367322da4e680893ec81f53d0654d27a266c989 100644
--- a/chromecast/browser/metrics/cast_metrics_service_client.cc
+++ b/chromecast/browser/metrics/cast_metrics_service_client.cc
@@ -52,6 +52,9 @@ void CastMetricsServiceClient::SetMetricsClientId(
   PlatformSetClientID(cast_service_, client_id);
 }
 
+void CastMetricsServiceClient::OnRecordingDisabled() {
+}
+
 void CastMetricsServiceClient::StoreClientInfo(
     const ::metrics::ClientInfo& client_info) {
   const std::string& client_id = client_info.client_id;