Make --enable-benchmarking not affect metrics recording.

ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm

 // Copyright 2015 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 "ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "components/metrics/enabled_state_provider.h"
@@ skipping 80 matching lines @@
 
 net::URLRequestContextGetter*
 IOSChromeMetricsServicesManagerClient::GetURLRequestContext() {
   return GetApplicationContext()->GetSystemURLRequestContext();
 }
 
 bool IOSChromeMetricsServicesManagerClient::IsMetricsReportingEnabled() {
   return enabled_state_provider_->IsReportingEnabled();
 }
 
-bool IOSChromeMetricsServicesManagerClient::OnlyDoMetricsRecording() {
-  const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
-  return cmdline->HasSwitch(switches::kIOSMetricsRecordingOnly);
-}
-
 metrics::MetricsStateManager*
 IOSChromeMetricsServicesManagerClient::GetMetricsStateManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!metrics_state_manager_) {
     metrics_state_manager_ = metrics::MetricsStateManager::Create(
         local_state_, enabled_state_provider_.get(),
         base::Bind(&PostStoreMetricsClientInfo),
         base::Bind(&LoadMetricsClientInfo));
   }
   return metrics_state_manager_.get();
 }