Get rid of some <label for> misuse in browser_options.html

chrome/browser/resources/options/clear_browser_data_overlay.js

Index: chrome/browser/resources/options/clear_browser_data_overlay.js
diff --git a/chrome/browser/resources/options/clear_browser_data_overlay.js b/chrome/browser/resources/options/clear_browser_data_overlay.js
index 679de21352bd6f02ac47aedfab42f8cfee274c28..4684943bcde4219eb236b60dc775a6eaa117dad2 100644
--- a/chrome/browser/resources/options/clear_browser_data_overlay.js
+++ b/chrome/browser/resources/options/clear_browser_data_overlay.js
@@ -120,8 +120,8 @@ cr.define('options', function() {
 
         if (buttonId != '') {
           var button = document.createElement('button');
-          button.setAttribute('id', buttonId);
-          button.setAttribute('class', 'link-button');
+          button.id = buttonId;
+          button.className = 'link-button';
           button.textContent = footerFragments[i + 1];
           footer.appendChild(button);
           i += 3;