Implement UMA log throttling for cellular connections

components/metrics/metrics_service_client.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_service_client.h"
 
 namespace metrics {
 
 base::string16 MetricsServiceClient::GetRegistryBackupKey() {
   return base::string16();
 }
 
 bool MetricsServiceClient::IsReportingPolicyManaged() {
   return false;
 }
 
 MetricsServiceClient::EnableMetricsDefault
 MetricsServiceClient::GetDefaultOptIn() {
   return DEFAULT_UNKNOWN;
 }
 
+bool MetricsServiceClient::IsUMACellularUploadLogicEnabled() {
+  return false;
+}
+
 }  // namespace metrics