Trying to move derived get trap from builtins to global context.

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index 66e1661b759cc6ed66888d0f69d5cee4f9e3b6f6..77b97aed837d654f8f8a3fda74cce5393674c25b 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -647,20 +647,3 @@ function DefaultString(x) {
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));
-
-
-/* ------------------------------------------
-- - -   H a r m o n y   P r o x i e s   - - -
----------------------------------------------
-*/
-
-function DERIVED_GET_TRAP(receiver, name) {
-  var desc = this.getPropertyDescriptor(name);
-  if (IS_UNDEFINED(desc)) { return desc; }
-  if ('value' in desc) {
-    return desc.value;
-  } else {
-    if (IS_UNDEFINED(desc.get)) { return desc.get; }
-    return desc.get().call(receiver);  // The proposal says so...
-  }
-}