Submit button does not show up on md-settings anymore.

chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.html

 <!-- TODO(crbug.com/603217): Use i18n instead of string literals. Figure out
                              what i18n to use for keypad, ie, does 1 ABC make
                              sense in every scenario? -->
 
 <link rel="import" href="chrome://resources/html/i18n_behavior.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-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-styles/paper-styles.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-icons/iron-icons.html">
 
@@ skipping 37 matching lines @@
 
       .digit-button.center-button {
         margin: 0 30px;
       }
 
       .digit-button.submit-button {
         left: 20px;
         position: relative;
       }
 
+      .digit-button.submit-button.submit-button-hidden {
+        display: none;
+      }
+
       .digit-button .icon-container {
         background: var(--paper-grey-400);
         border-radius: 100px;
         height: 24px;
         margin: auto;
         width: 24px;
       }
 
       .digit-button .icon-container.ready-background {
         background: var(--paper-blue-800);
@@ skipping 39 matching lines @@
         box-sizing: border-box;
         font-size: 18px;
         height: 64px;
         left: 20px;
         outline: 0;
         padding: 28px 3px 12px 3px;
         position: relative;
         width: 180px;
       }
 
+      #pin-input.submit-button-hidden {
+        border-bottom: 2px;
+        border-bottom-style: solid;
+        text-align: center;
+        width: 230px;
+      }
+
       #pin-input[type=number]::-webkit-inner-spin-button,
       #pin-input[type=number]::-webkit-outer-spin-button {
         -webkit-appearance: none;
         margin: 0;
       }
 
       /* Ensure that all children of paper-button do not consume events. This
        * simplifies the event handler code. */
       paper-button * {
         pointer-events: none;
       }
     </style>
 
     <div id="root">
       <div id="container-constrained-width">
         <div class="row horizontal-center">
           <input id="pin-input" type="[[computeInputType_(enablePassword)]]"
-                 class$="[[computeInputClass_(value)]]"
+                 class$="[[computeInputClass_(value)]]
+                         [[computeSubmitHiddenClass_(enableSubmitButton)]]"
                  placeholder="[[computeInputPlaceholder_(enablePassword)]]"
                  value="{{value::input}}"
                  on-keydown="onInputKeyDown_"></input>
-          <paper-button class="digit-button first-row submit-button"
+          <paper-button class$="digit-button first-row submit-button
+                                [[computeSubmitHiddenClass_(enableSubmitButton)]]"

[jdufault, 2016/07/29 19:12:13]

Fix wrapping; maybe rename the compute* to get*?

[sammiequon, 2016/07/29 19:44:49]

Done.

                         on-tap="firePinSubmitEvent_">
             <div class$="icon-container [[computeSubmitClass_(value)]]">
                 <iron-icon class="icon" icon="icons:forward"><iron-icon>
             </div>
           </paper-button>
         </div>
 
         <div class="row keyboard">
           <paper-button class="digit-button" on-tap="onNumberTap_" value="1">
             <inner-text>$i18n{pinKeyboard1}</inner-text>
@@ skipping 43 matching lines @@
             <inner-text class="icon-subheading">
               $i18n{pinKeyboardClear}
             </inner-text>
           </paper-button>
         </div>
       </div>
     </div>
   </template>
   <script src="pin_keyboard.js"></script>
 </dom-module>