Switch to using '-t ios' for grit

chrome/browser/resources/translate_internals/prefs.html

 <!--
 Copyright 2013 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 <div>
   <section id="prefs-blocked-languages">
     <h2>Languages not translated (New)</h2>
     <ul></ul>
   </section>
   <section id="prefs-language-blacklist">
     <h2>Languages not translated<span> (Old)</span></h2>
     <ul></ul>
   </section>
   <section id="prefs-site-blacklist">
     <h2>Sites not translated</h2>
     <ul></ul>
   </section>
   <section id="prefs-whitelists">
     <h2>Languages always translated</h2>
     <ul></ul>
   </section>
   <section id="prefs-supported-languages">
     <h2>Supported languages</h2>
     <p id="prefs-supported-languages-last-updated">Last updated: <span></span></p>
     <ul id="prefs-supported-languages-languages"></ul>
   </section>
-<if expr="not pp_ifdef('ios')">
+<if expr="not is_ios">
   <section id="prefs-cld-version">
     <h2>CLD Version</h2>
     <p i18n-content="cld-version"></p>
   </section>
 </if>
 </div>
 <div>
   <section id="prefs-dump">
     <h2>Dump</h2>
     <p class="dump"><p>
   </section>
 </div>