Refactor HashedExtensionMetrics into ExtensionsMetricsProvider.

chrome/browser/metrics/metrics_services_manager.cc

Index: chrome/browser/metrics/metrics_services_manager.cc
diff --git a/chrome/browser/metrics/metrics_services_manager.cc b/chrome/browser/metrics/metrics_services_manager.cc
index dfde05f450335350e4c75f2ac1a2432fae7eca22..276c3db40623ca414867a95f36b98180197153df 100644
--- a/chrome/browser/metrics/metrics_services_manager.cc
+++ b/chrome/browser/metrics/metrics_services_manager.cc
@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/metrics/extensions_metrics_provider.h"
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/browser/metrics/metrics_state_manager.h"
 #include "chrome/browser/metrics/variations/variations_service.h"
@@ -31,6 +32,9 @@ MetricsService* MetricsServicesManager::GetMetricsService() {
     metrics_service_.reset(
         new MetricsService(GetMetricsStateManager(), &metrics_service_client_));
     metrics_service_client_.set_service(metrics_service_.get());
+    metrics_service_->RegisterMetricsProvider(
+        scoped_ptr<metrics::MetricsProvider>(
+            new ExtensionsMetricsProvider(GetMetricsStateManager())));
   }
   return metrics_service_.get();
 }