[Object.observe] rename intrinsic change record types for consitency.

src/object-observe.js

Index: src/object-observe.js
diff --git a/src/object-observe.js b/src/object-observe.js
index 718920feb0ee2a5b0a250a13a374af2ac9c9efce..73a5d34c7ca2bcff899f60402f6fa15cb71e6042 100644
--- a/src/object-observe.js
+++ b/src/object-observe.js
@@ -128,11 +128,11 @@ function TypeMapIsDisjointFrom(typeMap1, typeMap2) {
 }
 
 var defaultAcceptTypes = TypeMapCreateFromList([
-  'new',
-  'updated',
-  'deleted',
-  'prototype',
-  'reconfigured',
+  'add',
+  'update',
+  'delete',
+  'setPrototype',
+  'reconfigure',
   'preventExtensions'
 ]);
 
@@ -353,9 +353,9 @@ function ObjectUnobserve(object, callback) {
 }
 
 function ArrayObserve(object, callback) {
-  return ObjectObserve(object, callback, ['new',
-                                          'updated',
-                                          'deleted',
+  return ObjectObserve(object, callback, ['add',
+                                          'update',
+                                          'delete',
                                           'splice']);
 }