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 0596928ef369f2a2dc603d8030790fc9f12b5a2a..fb73506fe4822b854202b766c00c84c9f983c88d 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();