md settings: Update lock screen to match new mocks.

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

Index: chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
diff --git a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
index 0c82fd2e3e8b33f13a90cf620987cef466a820a6..d3740c76c39c4fdc94efc0eeaef7bc46903561c7 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
@@ -62,7 +62,7 @@ Polymer({
      */
     enablePassword: {
       type: Boolean,
-      value: false
+      value: false,
     },
 
     /**
@@ -73,19 +73,10 @@ Polymer({
      */
     passwordElement: {
       type: Object,
-      value: function() { return this.$$('#pin-input'); },
-      observer: 'onPasswordElementAttached_'
-    },
-
-    /**
-     * The value stored in the keyboard's input element.
-     * @private
-     */
-    value: {
-      type: String,
-      notify: true,
-      value: '',
-      observer: 'onPinValueChange_'
+      value: function() {
+        return this.$.pinInput.inputElement;
+      },
+      observer: 'onPasswordElementAttached_',
     },
 
     /**
@@ -94,7 +85,7 @@ Polymer({
      */
     repeatBackspaceIntervalId_: {
       type: Number,
-      value: 0
+      value: 0,
     },
 
     /**
@@ -103,8 +94,28 @@ Polymer({
      */
     startAutoBackspaceId_: {
       type: Number,
-      value: 0
-    }
+      value: 0,
+    },
+
+    /**
+     * Whether or not to show the default pin input.
+     * @private
+     */
+    showPinInput_: {
+      type: Boolean,
+      value: false,
+    },
+
+    /**
+     * The value stored in the keyboard's input element.
+     * @private
+     */
+    value: {
+      type: String,
+      notify: true,
+      value: '',
+      observer: 'onPinValueChange_',
+    },
   },
 
   /**
@@ -113,8 +124,7 @@ Polymer({
    * @private
    */
   onPasswordElementAttached_: function(inputElement) {
-    if (inputElement != this.$$('#pin-input'))
-      this.$$('#pin-input').hidden = true;
+    this.showPinInput_ = inputElement == this.$.pinInput.inputElement;
     inputElement.addEventListener('input',
         this.handleInputChanged_.bind(this));
   },