Switch base::IDMap to use unique_ptr.

content/browser/service_worker/service_worker_context_core.cc

Index: content/browser/service_worker/service_worker_context_core.cc
diff --git a/content/browser/service_worker/service_worker_context_core.cc b/content/browser/service_worker/service_worker_context_core.cc
index d787d5c1d9e71227ef5df1d4b66fd1540badb902..9cf9858fb521669bbc0eee778627ff3774247ff3 100644
--- a/content/browser/service_worker/service_worker_context_core.cc
+++ b/content/browser/service_worker/service_worker_context_core.cc
@@ -641,9 +641,8 @@ ServiceWorkerContextCore::TransferProviderHostOut(int process_id,
           ? ServiceWorkerProviderHost::FrameSecurityLevel::SECURE
           : ServiceWorkerProviderHost::FrameSecurityLevel::INSECURE,
       AsWeakPtr(), transferee->dispatcher_host());
-  map->Replace(provider_id, replacement);
   transferee->PrepareForCrossSiteTransfer();
-  return base::WrapUnique(transferee);
+  return map->Replace(provider_id, base::WrapUnique(replacement));
 }
 
 void ServiceWorkerContextCore::TransferProviderHostIn(
@@ -661,8 +660,7 @@ void ServiceWorkerContextCore::TransferProviderHostIn(
                                         new_provider_id,
                                         temp->provider_type(),
                                         temp->dispatcher_host());
-  map->Replace(new_provider_id, transferee.release());
-  delete temp;
+  map->Replace(new_provider_id, std::move(transferee));
 }
 
 void ServiceWorkerContextCore::ClearAllServiceWorkersForTest(