Eliminate //chrome dependencies from MetricsServicesManager

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 20f1b57cd9b30ff393ec9e428185f22b82d18987..8ad37a6b97074718a76fad59bbfd0d16ec5129be 100644
--- a/chromecast/browser/metrics/cast_metrics_service_client.cc
+++ b/chromecast/browser/metrics/cast_metrics_service_client.cc
@@ -98,6 +98,10 @@ void CastMetricsServiceClient::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(kMetricsOldClientID, std::string());
 }
 
+::metrics::MetricsService* CastMetricsServiceClient::GetMetricsService() {
+  return metrics_service_.get();
+}
+
 void CastMetricsServiceClient::SetMetricsClientId(
     const std::string& client_id) {
   client_id_ = client_id;