Reduce plugin_metrics_provider_ usage in MetricsService

chrome/browser/metrics/metrics_service.h

Index: chrome/browser/metrics/metrics_service.h
diff --git a/chrome/browser/metrics/metrics_service.h b/chrome/browser/metrics/metrics_service.h
index 9af1b4bb817a68c5508cd2b3ebe10bce82fe02fe..0f57cc24c83fa254e3c441bbdd2daa6bb7efae35 100644
--- a/chrome/browser/metrics/metrics_service.h
+++ b/chrome/browser/metrics/metrics_service.h
@@ -207,7 +207,10 @@ class MetricsService
   bool recording_active() const;
   bool reporting_active() const;
 
-  void LogPluginLoadingError(const base::FilePath& plugin_path);
+  // TODO(blundell): Move this into ChromeMetricsServiceClient.
+  PluginMetricsProvider* plugin_metrics_provider() {
+    return plugin_metrics_provider_;
+  }
 
   // Redundant test to ensure that we are notified of a clean exit.
   // This value should be true when process has completed shutdown.