Hook up more import/exports in natives.

src/harmony-object.js

Index: src/harmony-object.js
diff --git a/src/harmony-object.js b/src/harmony-object.js
index f90de536f8fe09f636f0f5d8bcb07d575c01f055..382f7f4252b27e3761e85a8be1af2c62fb52082f 100644
--- a/src/harmony-object.js
+++ b/src/harmony-object.js
@@ -9,8 +9,19 @@
 
 %CheckIsBootstrapping();
 
+// -------------------------------------------------------------------
+// Imports
+
 var GlobalObject = global.Object;
 
+var OwnPropertyKeys;
+
+utils.Import(function(from) {
+  OwnPropertyKeys = from.OwnPropertyKeys;
+});
+
+// -------------------------------------------------------------------
+
 // ES6, draft 04-03-15, section 19.1.2.1
 function ObjectAssign(target, sources) {
   var to = TO_OBJECT_INLINE(target);
@@ -24,7 +35,7 @@ function ObjectAssign(target, sources) {
     }
 
     var from = TO_OBJECT_INLINE(nextSource);
-    var keys = $ownPropertyKeys(from);
+    var keys = OwnPropertyKeys(from);
     var len = keys.length;
 
     for (var j = 0; j < len; ++j) {
@@ -39,7 +50,7 @@ function ObjectAssign(target, sources) {
 }
 
 // Set up non-enumerable functions on the Object object.
-$installFunctions(GlobalObject, DONT_ENUM, [
+utils.InstallFunctions(GlobalObject, DONT_ENUM, [
   "assign", ObjectAssign
 ]);