Refactor UKM interface for mojo-ification

ios/chrome/browser/application_context_impl.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_APPLICATION_CONTEXT_IMPL_H_
 #define IOS_CHROME_BROWSER_APPLICATION_CONTEXT_IMPL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 32 matching lines @@
   void OnAppEnterForeground() override;
   void OnAppEnterBackground() override;
   bool WasLastShutdownClean() override;
   PrefService* GetLocalState() override;
   net::URLRequestContextGetter* GetSystemURLRequestContext() override;
   const std::string& GetApplicationLocale() override;
   ios::ChromeBrowserStateManager* GetChromeBrowserStateManager() override;
   metrics_services_manager::MetricsServicesManager* GetMetricsServicesManager()
       override;
   metrics::MetricsService* GetMetricsService() override;
-  ukm::UkmService* GetUkmService() override;
+  ukm::UkmRecorder* GetUkmRecorder() override;
   variations::VariationsService* GetVariationsService() override;
   rappor::RapporServiceImpl* GetRapporServiceImpl() override;
   net_log::ChromeNetLog* GetNetLog() override;
   network_time::NetworkTimeTracker* GetNetworkTimeTracker() override;
   IOSChromeIOThread* GetIOSChromeIOThread() override;
   gcm::GCMDriver* GetGCMDriver() override;
   component_updater::ComponentUpdateService* GetComponentUpdateService()
       override;
   CRLSetFetcher* GetCRLSetFetcher() override;
   physical_web::PhysicalWebDataSource* GetPhysicalWebDataSource() override;
@@ skipping 26 matching lines @@
   // Sequenced task runner for local state related I/O tasks.
   const scoped_refptr<base::SequencedTaskRunner> local_state_task_runner_;
 
   bool was_last_shutdown_clean_;
   bool created_local_state_;
 
   DISALLOW_COPY_AND_ASSIGN(ApplicationContextImpl);
 };
 
 #endif  // IOS_CHROME_BROWSER_APPLICATION_CONTEXT_IMPL_H_