PDF: Replace usage of i18nTemplate with Polymer data binding

chrome/browser/resources/pdf/elements/viewer-password-screen/viewer-password-screen.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/iron-flex-layout-classes.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/animations/fade-in-animation.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/animations/fade-out-animation.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-dialog/paper-dialog.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-input/paper-input.html">
 
 <dom-module id="viewer-password-screen">
   <template>
     <style include="iron-flex iron-flex-alignment"></style>
     <paper-dialog id="dialog" modal no-cancel-on-esc-key
         entry-animation="fade-in-animation" exit-animation="fade-out-animation">
-      <div id="message" i18n-content="passwordPrompt"></div>
+      <div id="message">{{strings.passwordPrompt}}</div>
       <div class="horizontal layout start">
         <paper-input-container id="password-container" class="flex"
             no-label-float invalid="[[invalid]]">
           <input is="iron-input" id="password" type="password" size="20"
               on-keypress="handleKey" autofocus>
           </input>
-          <paper-input-error i18n-content="passwordInvalid"></paper-input-error>
+          <paper-input-error>{{strings.passwordInvalid}}</paper-input-error>
         </paper-input-container>
-        <paper-button id="submit" on-click="submit"
-                                  i18n-content="passwordSubmit"></paper-button>
+        <paper-button id="submit" on-click="submit">
+          {{strings.passwordSubmit}}
+        </paper-button>
       </div>
     </paper-dialog>
   </template>
 </dom-module>
 <script src="viewer-password-screen.js"></script>