Move EntropyProvider Source From MetricsService to MetricsServicesManager

ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm

Index: ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
diff --git a/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm b/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
index f8a3b7f8b0cc3ed350658c6e2fc5575c483da97b..869a4c9dcc2365b9d848f2b0a1c5b48f522f1f3c 100644
--- a/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
+++ b/ios/chrome/browser/metrics/ios_chrome_metrics_services_manager_client.mm
@@ -80,6 +80,11 @@ IOSChromeMetricsServicesManagerClient::CreateMetricsServiceClient() {
   return IOSChromeMetricsServiceClient::Create(GetMetricsStateManager());
 }
 
+std::unique_ptr<const base::FieldTrial::EntropyProvider>
+IOSChromeMetricsServicesManagerClient::CreateEntropyProvider() {
+  return GetMetricsStateManager()->CreateDefaultEntropyProvider();
+}
+
 net::URLRequestContextGetter*
 IOSChromeMetricsServicesManagerClient::GetURLRequestContext() {
   return GetApplicationContext()->GetSystemURLRequestContext();