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 8e46d93b16c2b7c35bc7d782e60cff54be826441..cda9e23d9a77584f3499b99306faa3b347feccfb 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 NetworkTimeTracker;
 class NotificationUIManager;
 class PrefRegistrySimple;
@@ -102,6 +103,10 @@ 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;