Revert "Fix #3521 Use an object as the process.env proto"

The reverted commit caused a v8 assertion to trigger in debug mode.
This reverts commit e3074689f5.

src/node.cc

@@ -1959,8 +1959,8 @@ static Handle<Value> EnvGetter(Local<String> property,
     return scope.Close(String::New(reinterpret_cast<uint16_t*>(buffer), result));
   }
 #endif
-  // Not found.  Fetch from prototype.
-  return info.Data().As<Object>()->Get(property);
+  // Not found
+  return Undefined();
 }
 
 
@@ -2210,7 +2210,7 @@ Handle<Object> SetupProcessObject(int argc, char *argv[]) {
                                        EnvQuery,
                                        EnvDeleter,
                                        EnvEnumerator,
-                                       Object::New());
+                                       Undefined());
   Local<Object> env = envTemplate->NewInstance();
   process->Set(String::NewSymbol("env"), env);
 

test/simple/test-process-env.js

@@ -47,18 +47,8 @@ if (process.argv[2] == 'you-are-the-child') {
   // failed assertion results in process exiting with status code 1
   assert.equal(false, 'NODE_PROCESS_ENV_DELETED' in process.env);
   assert.equal(42, process.env.NODE_PROCESS_ENV);
-  assert.equal('asdf', process.env.hasOwnProperty);
-  var hasOwnProperty = Object.prototype.hasOwnProperty;
-  var has = hasOwnProperty.call(process.env, 'hasOwnProperty');
-  assert.equal(true, has);
   process.exit(0);
 } else {
-  assert.equal(Object.prototype.hasOwnProperty, process.env.hasOwnProperty);
-  var has = process.env.hasOwnProperty('hasOwnProperty');
-  assert.equal(false, has);
-
-  process.env.hasOwnProperty = 'asdf';
-
   process.env.NODE_PROCESS_ENV = 42;
   assert.equal(42, process.env.NODE_PROCESS_ENV);