Merge histograms from providers into StatisticsRecorder for display.

components/metrics/metrics_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/metrics_provider.h"
 
 namespace metrics {
 
 MetricsProvider::MetricsProvider() {
 }
@@ skipping 32 matching lines @@
     SystemProfileProto* system_profile_proto) {
 }
 
 void MetricsProvider::ClearSavedStabilityMetrics() {
 }
 
 void MetricsProvider::ProvideGeneralMetrics(
     ChromeUserMetricsExtension* uma_proto) {
 }
 
-void MetricsProvider::MergeHistogramDeltas() {
-}
-
 void MetricsProvider::RecordHistogramSnapshots(
     base::HistogramSnapshotManager* snapshot_manager) {
 }
 
 void MetricsProvider::RecordInitialHistogramSnapshots(
     base::HistogramSnapshotManager* snapshot_manager) {
 }
 
 }  // namespace metrics