Call preventDefault in all on-tap events that show a dialog.

chrome/browser/resources/settings/site_settings/site_details.js

Index: chrome/browser/resources/settings/site_settings/site_details.js
diff --git a/chrome/browser/resources/settings/site_settings/site_details.js b/chrome/browser/resources/settings/site_settings/site_details.js
index f60a905c01045d99d439d91fdcc6838027d46834..d4ff566974a3150511c9bb299be1916af6769867 100644
--- a/chrome/browser/resources/settings/site_settings/site_details.js
+++ b/chrome/browser/resources/settings/site_settings/site_details.js
@@ -83,9 +83,11 @@ Polymer({
 
   /**
    * Confirms the deletion of storage for a site.
+   * @param {Event} e The polymer event.
    * @private
    */
-  onConfirmClearStorage_: function() {
+  onConfirmClearStorage_: function(e) {
+    e.preventDefault();
     this.confirmationDeleteMsg_ = loadTimeData.getStringF(
         'siteSettingsSiteRemoveConfirmation',
         this.toUrl(this.site.origin).href);