Revert of Wrap v8natives.js into a function.

src/weak-collection.js

Index: src/weak-collection.js
diff --git a/src/weak-collection.js b/src/weak-collection.js
index f7c3e290df588bcd4da0d60b1a4f1dda93dacb2e..02804aff72e399a0450c79dbcbae4a270756bc90 100644
--- a/src/weak-collection.js
+++ b/src/weak-collection.js
@@ -90,7 +90,7 @@
                   DONT_ENUM | READ_ONLY);
 
 // Set up the non-enumerable functions on the WeakMap prototype object.
-$installFunctions(GlobalWeakMap.prototype, DONT_ENUM, [
+InstallFunctions(GlobalWeakMap.prototype, DONT_ENUM, [
   "get", WeakMapGet,
   "set", WeakMapSet,
   "has", WeakMapHas,
@@ -162,7 +162,7 @@
                   DONT_ENUM | READ_ONLY);
 
 // Set up the non-enumerable functions on the WeakSet prototype object.
-$installFunctions(GlobalWeakSet.prototype, DONT_ENUM, [
+InstallFunctions(GlobalWeakSet.prototype, DONT_ENUM, [
   "add", WeakSetAdd,
   "has", WeakSetHas,
   "delete", WeakSetDelete