Change cast's UMA product type from CHROME to CAST.

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 24fdcfcc008a550413610b3c472c2c1c3b750657..339170d21c4a0cebf72877c95c87f88c55e31064 100644
--- a/chromecast/browser/metrics/cast_metrics_service_client.cc
+++ b/chromecast/browser/metrics/cast_metrics_service_client.cc
@@ -167,7 +167,7 @@ bool CastMetricsServiceClient::IsOffTheRecordSessionActive() {
 
 int32_t CastMetricsServiceClient::GetProduct() {
   // Chromecast currently uses the same product identifier as Chrome.
-  return ::metrics::ChromeUserMetricsExtension::CHROME;
+  return ::metrics::ChromeUserMetricsExtension::CAST;
 }
 
 std::string CastMetricsServiceClient::GetApplicationLocale() {