Revert of [i18n] chromeos login i18n-content to $i18n{}

chrome/browser/resources/chromeos/login/oobe_screen_network.html

 <!-- Copyright 2016 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 class="step hidden animated" id="connect" role="group" hidden>
   <div id="oobe-poly-connect" class="md-container">
     <oobe-welcome-md id="oobe-welcome-md" hidden>
     </oobe-welcome-md>
   </div>
   <div id="oobe-connect">
     <div class="step-contents">
-      <div id="welcome-message">$i18n{networkScreenGreeting}</div>
+      <div id="welcome-message" i18n-content="networkScreenGreeting">
+      </div>
       <div class="control-with-label">
-        <label id="language-select-label" class="label">
-          $i18n{selectLanguage}
-        </label>
+        <label id="language-select-label" i18n-content="selectLanguage"
+               class="label"></label>
         <div class="menu-area" aria-labelledby="language-select-label">
           <select id="language-select" class="menu-control"></select>
         </div>
       </div>
       <div class="control-with-label">
-        <label id="keyboard-select-label" class="label">
-          $i18n{selectKeyboard}
-        </label>
+        <label id="keyboard-select-label" i18n-content="selectKeyboard"
+               class="label"></label>
         <div class="menu-area" aria-labelledby="keyboard-select-label">
           <select id="keyboard-select" class="menu-control"></select>
         </div>
       </div>
       <div class="control-with-label" id="network-timezone-setting">
-        <label id="timezone-select-label" class="label">
-          $i18n{selectTimezone}
-        </label>
+        <label id="timezone-select-label" i18n-content="selectTimezone"
+               class="label"></label>
         <div class="menu-area" aria-labelledby="timezone-select-label">
           <select id="timezone-select" class="menu-control"></select>
         </div>
       </div>
       <div class="control-with-label">
-        <label id="networks-list-label" class="label">
-          $i18n{selectNetwork}
-        </label>
+        <label id="networks-list-label" i18n-content="selectNetwork"
+               class="label"></label>
         <div class="menu-area">
           <div id="networks-list" aria-labelledby="networks-list-label"
                class="menu-control"></div>
         </div>
       </div>
     </div>
     <div id="connect-controls" class="step-controls"></div>
     <div id="connect-extra-controls" class="step-extra-controls">
       <div id="connect-accessibility">
-        <a id="connect-accessibility-link" href="#" role="button">
-          $i18n{accessibilityLink}
-        </a>
+        <a id="connect-accessibility-link" href="#" role="button"
+           i18n-content="accessibilityLink"></a>
       </div>
       <div class="connect-debugging-specific">
-        <a id="connect-debugging-features-link" href="#" role="button">
-          $i18n{debuggingFeaturesLink}
-        </a>
+        <a id="connect-debugging-features-link" href="#" role="button"
+           i18n-content="debuggingFeaturesLink"></a>
       </div>
     </div>
   </div>
 </div>