Update iOS grit whitelist.

TBR=stuartmorgan@chromium.org
BUG=none

Review URL: https://codereview.chromium.org/1053883003

Cr-Original-Commit-Position: refs/heads/master@{#324870}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b399e75005c985a0d100a4543a77fe9855342dc2

ios/grit_whitelist.txt

@@ -100,7 +100,7 @@ IDR_SYNC_INTERNALS_TYPES_JS
 IDR_TOOLBAR_SHADOW_FULL_BLEED
 IDR_TRANSLATE_JS
 IDR_UBER_UTILS_JS
-IDR_WEBUI_I18N_TEMPLATE2_JS
+IDR_WEBUI_I18N_TEMPLATE_JS
 IDR_WEBUI_I18N_TEMPLATE_POLYMER_JS
 IDR_WEBUI_JSTEMPLATE_JS
 IDR_WEBUI_JS_LOAD_TIME_DATA