Create Ukm ReportingService implementation.

components/metrics/metrics_service.cc

Index: components/metrics/metrics_service.cc
diff --git a/components/metrics/metrics_service.cc b/components/metrics/metrics_service.cc
index 05d875b1e97cbb28644a7b477a53d3a4abd7c02f..207a66d6287d0ded90effd4aeb8a9f8690c338a2 100644
--- a/components/metrics/metrics_service.cc
+++ b/components/metrics/metrics_service.cc
@@ -204,16 +204,13 @@ void MetricsService::RegisterPrefs(PrefRegistrySimple* registry) {
   MetricsStateManager::RegisterPrefs(registry);
   MetricsLog::RegisterPrefs(registry);
   StabilityMetricsProvider::RegisterPrefs(registry);
-  DataUseTracker::RegisterPrefs(registry);
   ExecutionPhaseManager::RegisterPrefs(registry);
+  MetricsReportingService::RegisterPrefs(registry);
 
   registry->RegisterInt64Pref(prefs::kInstallDate, 0);
 
   registry->RegisterIntegerPref(prefs::kMetricsSessionID, -1);
 
-  registry->RegisterListPref(prefs::kMetricsInitialLogs);
-  registry->RegisterListPref(prefs::kMetricsOngoingLogs);
-
   registry->RegisterInt64Pref(prefs::kUninstallLaunchCount, 0);
   registry->RegisterInt64Pref(prefs::kUninstallMetricsUptimeSec, 0);
 }