Revert of Add WeakMap to v8.h

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index c1c818cfeea189c568090e690adf743033bfa355..8226a0e5d7f0e92dfe4775a327fee2776b16a55e 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -2233,15 +2233,6 @@
     Object::SetProperty(result, callee_string(), callee, STRICT).Assert();
   }
   return result;
-}
-
-
-Handle<JSWeakMap> Factory::NewJSWeakMap() {
-  // TODO(adamk): Currently the map is only created three times per
-  // isolate. If it's created more often, the map should be moved into the
-  // strong root list.
-  Handle<Map> map = NewMap(JS_WEAK_MAP_TYPE, JSWeakMap::kSize);
-  return Handle<JSWeakMap>::cast(NewJSObjectFromMap(map));
 }