Fix build on other platforms

atom/browser/api/atom_api_in_app_purchase.cc

@@ -51,6 +51,7 @@ namespace atom {
 
 namespace api {
 
+#if defined(OS_MACOSX)
 // static
 mate::Handle<InAppPurchase> InAppPurchase::Create(v8::Isolate* isolate) {
   return mate::CreateHandle(isolate, new InAppPurchase(isolate));
@@ -86,6 +87,7 @@ void InAppPurchase::OnTransactionsUpdated(
     const std::vector<in_app_purchase::Transaction>& transactions) {
   Emit("transactions-updated", transactions);
 }
+#endif
 
 }  // namespace api
 

atom/browser/mac/in_app_purchase_observer.mm

@@ -63,7 +63,7 @@ using InAppTransactionCallback =
  *
  * @param transaction - The transaction to pass to the callback.
  */
-- (void)runCallback:(NSArray<SKPaymentTransaction*>*)transactions {
+- (void)runCallback:(NSArray*)transactions {
   // Convert the transaction.
   std::vector<in_app_purchase::Transaction> converted;
   converted.reserve([transactions count]);