Submit button incompatiable with desktop chrome.

ui/login/account_picker/user_pod_template.html

 <iron-iconset-svg name="user-pod" size="24">
   <svg>
     <defs>
       <!--
       Inlined from Polymer's iron-icons to avoid importing everything.
       See http://goo.gl/Y1OdAq for instructions on adding additional icons.
       -->
       <g id="arrow-forward"><path d="M12 4l-1.41 1.41L16.17 11H4v2h12.17l-5.58 5.59L12 20l8-8z"/></g>
     </defs>
   </svg>
@@ skipping 23 matching lines @@
         <div class="learn-more"></div>
       </div>
     </div>
     <div class="auth-container">
       <!-- Password Authentication -->
       <div class="password-entry-container">
         <div class="password-container">
           <input type="password" class="password"
                  i18n-values="placeholder:passwordHint">
         </div>
+<if expr="chromeos">
         <div class="capslock-hint-container">
           <img class="capslock-hint"
                src="chrome://theme/IDR_LOGIN_PASSWORD_CAPS_LOCK" alt>
         </div>
         <paper-icon-button class="submit-button" disabled
                            icon="user-pod:arrow-forward">
         </paper-icon-button>
+</if>
       </div>
       <!-- User Click Authentication -->
       <div class="password-label"></div>
       <div class="signin-transition-container">
         <span class="signing-in-label" i18n-content="signingIn"></span>
         <span class="animated-ellipsis-component0">.</span>
         <span class="animated-ellipsis-component1">.</span>
         <span class="animated-ellipsis-component2">.</span>
       </div>
       <div class="custom-icon-container" hidden></div>
@@ skipping 119 matching lines @@
              i18n-content="publicSessionLanguageAndInput"></a>
         </div>
         <button class="enter-button"
                 i18n-content="publicAccountEnter"
                 i18n-values="aria-label:publicAccountEnterAccessibleName">
         </button>
       </div>
     </div>
   </div>
 </div>