Merge histograms from providers into StatisticsRecorder for display.

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index 43d9fafaff2cd34d223ab590fcf176442e470d63..388998ddc0487e0b059183c5c2ee40ca48e0229f 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -572,11 +572,6 @@ void MetricsService::UpdateMetricsUsagePrefs(const std::string& service_name,
   }
 }
 
-void MetricsService::MergeHistogramDeltas() {
-  for (MetricsProvider* provider : metrics_providers_)
-    provider->MergeHistogramDeltas();
-}
-
 //------------------------------------------------------------------------------
 // private methods
 //------------------------------------------------------------------------------