Avoid needless hasOwnProperty check in deepFreeze.

The "own" in getOwnPropertyNames ensures that all the names would pass the
hasOwnProperty test.

#3300 (comment)

Regarding this comment by @jamesreggio, I would much rather patch
apollo-utilities than revert the use of Object.create(null), since empty
prototype-free objects never accidentally appear to have properties
inherited from Object.prototype (a correctness concern), and lookups of
missing properties are faster since there's no prototype chain. Far from
being deficient, Object.create(null) objects are what empty objects should
always have been in JavaScript.

packages/apollo-utilities/CHANGELOG.md

@@ -9,6 +9,9 @@
   `{ prop2: 'value2', prop1: 'value1' }`.
   [PR #2869](https://github.com/apollographql/apollo-client/pull/2869)
 
+- Avoid needless `hasOwnProperty` check in `deepFreeze`.
+  [PR #3545](https://github.com/apollographql/apollo-client/pull/3545)
+
 ### 1.0.13
 
 - Make `maybeDeepFreeze` a little more defensive, by always using

packages/apollo-utilities/src/util/maybeDeepFreeze.ts

@@ -5,11 +5,8 @@ import { isDevelopment, isTest } from './environment';
 function deepFreeze(o: any) {
   Object.freeze(o);
 
-  const hasOwn = Object.prototype.hasOwnProperty;
-
   Object.getOwnPropertyNames(o).forEach(function(prop) {
     if (
-      hasOwn.call(o, prop) &&
       o[prop] !== null &&
       (typeof o[prop] === 'object' || typeof o[prop] === 'function') &&
       !Object.isFrozen(o[prop])