[runtime] [proxy] implementing [[Get]] trap.

src/js/proxy.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 53 matching lines @@
   }
 }
 
 function DelegateCallAndConstruct(callTrap, constructTrap) {
   return function() {
     return %Apply(IS_UNDEFINED(new.target) ? callTrap : constructTrap,
                   this, arguments, 0, %_ArgumentsLength())
   }
 }
 
-function DerivedGetTrap(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 }
-    // The proposal says: desc.get.call(receiver)
-    return %_Call(desc.get, receiver)
-  }
-}
-
 function DerivedSetTrap(receiver, name, val) {
   var desc = this.getOwnPropertyDescriptor(name)
   if (desc) {
     if ('writable' in desc) {
       if (desc.writable) {
         desc.value = val
         this.defineProperty(name, desc)
         return true
       } else {
         return false
@@ skipping 89 matching lines @@
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.ProxyDelegateCallAndConstruct = DelegateCallAndConstruct;
   to.ProxyDerivedHasOwnTrap = DerivedHasOwnTrap;
   to.ProxyDerivedKeysTrap = DerivedKeysTrap;
 });
 
 %InstallToContext([
-  "derived_get_trap", DerivedGetTrap,
   "proxy_enumerate", ProxyEnumerate,
 ]);
 
 })