[promises] Do not export GlobalPromise

src/js/async-await.js

Index: src/js/async-await.js
diff --git a/src/js/async-await.js b/src/js/async-await.js
index 0723f7ecfeba921039b1e47bbaa299f3381452c3..ea14db68eaddff2e7482e1168055af878f502614 100644
--- a/src/js/async-await.js
+++ b/src/js/async-await.js
@@ -13,7 +13,6 @@
 
 var AsyncFunctionNext;
 var AsyncFunctionThrow;
-var GlobalPromise;
 var IsPromise;
 var CreateInternalPromiseCapability;
 var PerformPromiseThen;
@@ -25,7 +24,6 @@ var ResolvePromise;
 utils.Import(function(from) {
   AsyncFunctionNext = from.AsyncFunctionNext;
   AsyncFunctionThrow = from.AsyncFunctionThrow;
-  GlobalPromise = from.GlobalPromise;
   IsPromise = from.IsPromise;
   CreateInternalPromiseCapability = from.CreateInternalPromiseCapability;
   PerformPromiseThen = from.PerformPromiseThen;