chromeos: Backspace and enter key works as intended.

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/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.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/color.html">
@@ skipping 58 matching lines @@
       }
 
       .top-row {
         margin-top: 6px;
       }
 
       .digit-button.backspace-button {
         opacity: var(--dark-primary-opacity);
       }
 
-      .digit-button.backspace-button[disabled] {
+      .digit-button.backspace-button:not([has-content]) {
         color: #000;
         opacity: 0.26;
         padding: 14px;
       }
 
-      .digit-button.submit-button {
-        color: var(--google-blue-500);
-        height: 43px;
-        left: 137px;
-        margin: 0;
-        min-height: 43px;
-        min-width: 43px;
-        opacity: var(--light-primary-opacity);
-        padding: 11.5px 10px;
-        position: absolute;
-        width: 43px;
-      }
-
-      .digit-button.submit-button[disabled] {
-        color: #000;
-        opacity: 0.26;

[jdufault, 2016/09/20 22:53:59]

Unused css?

[sammiequon, 2016/09/21 01:37:00]

Yeah, forgot to remove when the submit button was moved to the user pod.

-      }
-
       .digit-button inner-text {
         color: var(--paper-blue-grey-700);
         display: flex;
         flex-direction: column;
         height: 52px;
       }
 
       #pin-input {
         -webkit-text-security: disc;
         background-color: white;
@@ skipping 90 matching lines @@
             <inner-text>$i18n{pinKeyboard7}</inner-text>
           </paper-button>
           <paper-button class="digit-button" on-tap="onNumberTap_" value="8">
             <inner-text>$i18n{pinKeyboard8}</inner-text>
           </paper-button>
           <paper-button class="digit-button" on-tap="onNumberTap_" value="9">
             <inner-text>$i18n{pinKeyboard9}</inner-text>
           </paper-button>
         </div>
         <div class="row keyboard bottom-row">
-          <div class="digit-button"></div>
+          <div class="digit-button blank-space"></div>
           <paper-button class="digit-button" on-tap="onNumberTap_" value="0">
             <inner-text>$i18n{pinKeyboard0}</inner-text>
           </paper-button>
           <paper-icon-button class="digit-button backspace-button"
-                             disabled="[[!hasInput_(value)]]"
+                             has-content$="[[hasInput_(value)]]"
                              icon="pin-keyboard:backspace"
                              on-pointerdown="onBackspacePointerDown_"
                              on-pointerout="onBackspacePointerOut_"
                              on-pointerup="onBackspacePointerUp_">
           </paper-icon-button>
         </div>
       </div>
     </div>
   </template>
   <script src="pin_keyboard.js"></script>
 </dom-module>