Merge histograms from providers into StatisticsRecorder for display.

components/metrics/metrics_service.h

Index: components/metrics/metrics_service.h
diff --git a/components/metrics/metrics_service.h b/components/metrics/metrics_service.h
index f00dcc760ab43077b827ae35285012f4fe070ec2..36427b1e7b588ab92ce6e1b1ad84ae4dfd65f29b 100644
--- a/components/metrics/metrics_service.h
+++ b/components/metrics/metrics_service.h
@@ -198,9 +198,6 @@ class MetricsService : public base::HistogramFlattener {
                                int message_size,
                                bool is_cellular);
 
-  // Merge any data from metrics providers into the global StatisticsRecorder.
-  void MergeHistogramDeltas();
-
  protected:
   // Exposed for testing.
   MetricsLogManager* log_manager() { return &log_manager_; }