Use import/export for more functions (instead of js builtins object).

src/js/collection.js

Index: src/js/collection.js
diff --git a/src/js/collection.js b/src/js/collection.js
index 8bf6ec3515baf2c2ebd2b4ead4c300671ea8064e..1ae9052017c5cbbbca1e6ba1ab84afcf8e835a54 100644
--- a/src/js/collection.js
+++ b/src/js/collection.js
@@ -2,9 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-var $getHash;
-var $getExistingHash;
-
 (function(global, utils) {
 "use strict";
 
@@ -462,10 +459,6 @@ utils.InstallFunctions(GlobalMap.prototype, DONT_ENUM, [
   "forEach", MapForEach
 ]);
 
-// Expose to the global scope.
-$getHash = GetHash;
-$getExistingHash = GetExistingHash;
-
 function MapFromArray(array) {
   var map = new GlobalMap;
   var length = array.length;
@@ -501,4 +494,9 @@ function SetFromArray(array) {
   "set_from_array",SetFromArray,
 ]);
 
+utils.Export(function(to) {
+  to.GetExistingHash = GetExistingHash;
+  to.GetHash = GetHash;
+});
+
 })