Show username on password manager list tooltip

BUG=chromium:330145
TEST=On password manager list, username should be displayed on its section tooltip

R=dbeam@chromium.org, estade@chromium.org, jhawkins@chromium.org

Review URL: https://codereview.chromium.org/122003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243244 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/options/password_manager_list.js

@@ -56,6 +56,7 @@ cr.define('options.passwordManager', function() {
       var usernameLabel = this.ownerDocument.createElement('div');
       usernameLabel.className = 'name';
       usernameLabel.textContent = this.username;
+      usernameLabel.title = this.username;
       this.contentElement.appendChild(usernameLabel);
 
       // The stored password.