Add myself as an OWNER to //components/translate for iOS.

Change-Id: I53fc40fe8efebf71c0fe4831cfbd8bcb8deab138
Reviewed-on: https://chromium-review.googlesource.com/c/1289438
Commit-Queue: John Wu <jzw@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604115}

components/translate/OWNERS

 # Subject matter experts:
 #   Android, CLD and language detection: andrewhayden@chromium.org
 #   Componentization and iOS: droger@chromium.org
+#                             jzw@chromium.org
 #   "Bubble" UI and translate internals: groby@chromium.org
 #                                        hajimehoshi@chromium.org
 #   CSP and isolated worlds: toyoshim@chromium.org
@@ -9,6 +10,7 @@ anthonyvd@chromium.org
 droger@chromium.org
 groby@chromium.org
 hajimehoshi@chromium.org
+jzw@chromium.org
 martis@chromium.org
 napper@chromium.org
 toyoshim@chromium.org