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 55164d1f2c013d91edb20b6b4f97f65d78d664cf..7e5b492ffc1f660f0a8eb6a6d3222b3ff01b5c9f 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -559,11 +559,6 @@ void MetricsService::UpdateMetricsUsagePrefs(const std::string& service_name,
   }
 }
 
-void MetricsService::MergeHistogramDeltas() {
-  for (MetricsProvider* provider : metrics_providers_)
-    provider->MergeHistogramDeltas();
-}
-
 //------------------------------------------------------------------------------
 // private methods
 //------------------------------------------------------------------------------