Changed look of pin keyboard.

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 a5cbe3b7c5c1c5616a7a1ababb4cc36f279640c4..0186e3facbfd3c988435fedd94ab3a3ba6a4cb1e 100644
--- a/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
+++ b/chrome/browser/resources/chromeos/quick_unlock/pin_keyboard.js
@@ -14,6 +14,13 @@ Polymer({
     input.value += value;
   },
 
+  // Called when the user wants to erase the last character of the entered
+  // PIN value.
+  onPinClear_: function() {
+    var pin = this.$$('#pin-input');
+    pin.value = pin.value.substring(0, pin.value.length - 1);
+  },
+
   // Called when the user wants to submit the PIN.
   onPinSubmit_: function() {
     var pin = this.$$('#pin-input').value;