Make all global private symbols own symbols.

src/promise.js

Index: src/promise.js
diff --git a/src/promise.js b/src/promise.js
index 9e88aa56ce042a5e90c49adf65d7e832fe30b10b..b6e03d77f6d0f91c38b71f78cb6cfbf6f7c8c01d 100644
--- a/src/promise.js
+++ b/src/promise.js
@@ -25,12 +25,12 @@ var PromiseHasRejectHandler;
 // TODO(jkummerow/rossberg/yangguo): Find a better solution.
 
 // Status values: 0 = pending, +1 = resolved, -1 = rejected
-var promiseStatus = GLOBAL_PRIVATE("Promise#status");
-var promiseValue = GLOBAL_PRIVATE("Promise#value");
-var promiseOnResolve = GLOBAL_PRIVATE("Promise#onResolve");
-var promiseOnReject = GLOBAL_PRIVATE("Promise#onReject");
-var promiseRaw = GLOBAL_PRIVATE("Promise#raw");
-var promiseDebug = GLOBAL_PRIVATE("Promise#debug");
+var promiseStatus = GLOBAL_PRIVATE_OWN("Promise#status");
+var promiseValue = GLOBAL_PRIVATE_OWN("Promise#value");
+var promiseOnResolve = GLOBAL_PRIVATE_OWN("Promise#onResolve");
+var promiseOnReject = GLOBAL_PRIVATE_OWN("Promise#onReject");
+var promiseRaw = GLOBAL_PRIVATE_OWN("Promise#raw");
+var promiseDebug = GLOBAL_PRIVATE_OWN("Promise#debug");
 var lastMicrotaskId = 0;
 
 (function() {
@@ -146,7 +146,7 @@ var lastMicrotaskId = 0;
   // For bootstrapper.
 
   IsPromise = function IsPromise(x) {
-    return IS_SPEC_OBJECT(x) && HAS_PRIVATE(x, promiseStatus);
+    return IS_SPEC_OBJECT(x) && !IS_PRIVATE_OWN_UNDEFINED(x, promiseStatus);
   }
 
   PromiseCreate = function PromiseCreate() {
@@ -162,7 +162,7 @@ var lastMicrotaskId = 0;
     // Check promiseDebug property to avoid duplicate event.
     if (DEBUG_IS_ACTIVE &&
         GET_PRIVATE(promise, promiseStatus) == 0 &&
-        !HAS_PRIVATE(promise, promiseDebug)) {
+        IS_PRIVATE_OWN_UNDEFINED(promise, promiseDebug)) {
       %DebugPromiseRejectEvent(promise, r);
     }
     PromiseDone(promise, -1, r, promiseOnReject)