Make --enable-benchmarking not affect metrics recording.

ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_
 #define IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 26 matching lines @@
   std::unique_ptr<rappor::RapporServiceImpl> CreateRapporServiceImpl() override;
   std::unique_ptr<variations::VariationsService> CreateVariationsService()
       override;
   std::unique_ptr<metrics::MetricsServiceClient> CreateMetricsServiceClient()
       override;
   std::unique_ptr<const base::FieldTrial::EntropyProvider>
   CreateEntropyProvider() override;
 
   net::URLRequestContextGetter* GetURLRequestContext() override;
   bool IsMetricsReportingEnabled() override;
-  bool OnlyDoMetricsRecording() override;
 
   // Gets the MetricsStateManager, creating it if it has not already been
   // created.
   metrics::MetricsStateManager* GetMetricsStateManager();
 
   // MetricsStateManager which is passed as a parameter to service constructors.
   std::unique_ptr<metrics::MetricsStateManager> metrics_state_manager_;
 
   // EnabledStateProvider to communicate if the client has consented to metrics
   // reporting, and if it's enabled.
   std::unique_ptr<metrics::EnabledStateProvider> enabled_state_provider_;
 
   // Ensures that all functions are called from the same thread.
   base::ThreadChecker thread_checker_;
 
   // Weak pointer to the local state prefs store.
   PrefService* local_state_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeMetricsServicesManagerClient);
 };
 
 #endif  // IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_