Re-write many calls to WrapUnique() with MakeUnique()

ios/chrome/browser/application_context_impl.cc

Index: ios/chrome/browser/application_context_impl.cc
diff --git a/ios/chrome/browser/application_context_impl.cc b/ios/chrome/browser/application_context_impl.cc
index 83b6a89dbc9920b50296b77a9e15ff7309635055..0b048908cef1764ff60c9d0ee9e088fa026cae78 100644
--- a/ios/chrome/browser/application_context_impl.cc
+++ b/ios/chrome/browser/application_context_impl.cc
@@ -222,8 +222,9 @@ ApplicationContextImpl::GetMetricsServicesManager() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (!metrics_services_manager_) {
     metrics_services_manager_.reset(
-        new metrics_services_manager::MetricsServicesManager(base::WrapUnique(
-            new IOSChromeMetricsServicesManagerClient(GetLocalState()))));
+        new metrics_services_manager::MetricsServicesManager(
+            base::MakeUnique<IOSChromeMetricsServicesManagerClient>(
+                GetLocalState())));
   }
   return metrics_services_manager_.get();
 }