Reduce plugin_metrics_provider_ usage in MetricsService

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index ed3e110d479e60cc0ae23002f4c2402d044acadf..fefc63f650c9933cf51b2da1a8965b2d1f59276a 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -29,6 +29,7 @@ class IntranetRedirectDetector;
 class IOThread;
 class MediaFileSystemRegistry;
 class MetricsService;
+class MetricsServicesManager;
 class NotificationUIManager;
 class PrefRegistrySimple;
 class PrefService;
@@ -109,6 +110,10 @@ class BrowserProcess {
   // continue shutdown.
   virtual void EndSession() = 0;
 
+  // Gets the manager for the various metrics-related services, constructing it
+  // if necessary.
+  virtual MetricsServicesManager* GetMetricsServicesManager() = 0;
+
   // Services: any of these getters may return NULL
   virtual MetricsService* metrics_service() = 0;
   virtual rappor::RapporService* rappor_service() = 0;