Unified icon-buttons used in the new GAIA flow.

chrome/browser/resources/chromeos/login/screen_gaia_signin.js

Index: chrome/browser/resources/chromeos/login/screen_gaia_signin.js
diff --git a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
index ed4d0d1c823aba6a38f884822ecd2b6d9d071537..323b2a8efdb0c695e46f300f3bcd449b98d4be9d 100644
--- a/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
+++ b/chrome/browser/resources/chromeos/login/screen_gaia_signin.js
@@ -179,20 +179,12 @@ login.createScreen('GaiaSigninScreen', 'gaia-signin', function() {
         e.preventDefault();
       });
 
-      $('back-button-item').addEventListener('mousedown', function(e) {
-        e.preventDefault();
-      });
-
       $('back-button-item').addEventListener('click', function(e) {
         $('back-button-item').hidden = true;
         $('signin-frame').back();
         e.preventDefault();
       });
 
-      $('close-button-item').addEventListener('mousedown', function(e) {
-        e.preventDefault();
-      });
-
       $('close-button-item').addEventListener('click', function(e) {
         this.cancel();
         e.preventDefault();