[promises] Do not export GlobalPromise

This is unused.

BUG=v8:5343
TBR=littledan@chromium.org

Review-Url: https://codereview.chromium.org/2513413002
Cr-Commit-Position: refs/heads/master@{#41148}

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;

src/js/promise.js

@@ -647,7 +647,6 @@ utils.Export(function(to) {
   to.PromiseCreate = PromiseCreate;
   to.PromiseThen = PromiseThen;
 
-  to.GlobalPromise = GlobalPromise;
   to.CreateInternalPromiseCapability = CreateInternalPromiseCapability;
   to.PerformPromiseThen = PerformPromiseThen;
   to.ResolvePromise = ResolvePromise;