Chromecast buildfix: MetricsService has moved to metrics namespace.

chromecast/metrics/platform_metrics_providers.h

Index: chromecast/metrics/platform_metrics_providers.h
diff --git a/chromecast/metrics/platform_metrics_providers.h b/chromecast/metrics/platform_metrics_providers.h
index d656b39f891c60bafe2d6a8879ee6a88e4ce137c..9d847e5c39b7171efa04840044bbc1656a25e78a 100644
--- a/chromecast/metrics/platform_metrics_providers.h
+++ b/chromecast/metrics/platform_metrics_providers.h
@@ -7,13 +7,16 @@
 
 #include "components/metrics/proto/system_profile.pb.h"
 
+namespace metrics {
 class MetricsService;
+}
 
 namespace chromecast {
 namespace metrics {
 
 // Build-level hook for different platforms to provide data to MetricsService.
-void RegisterPlatformMetricsProviders(MetricsService* metrics_service);
+void RegisterPlatformMetricsProviders(
+    ::metrics::MetricsService* metrics_service);
 
 // Returns the current release channel.
 ::metrics::SystemProfileProto::Channel GetPlatformReleaseChannel();