Copy item so dialog won't update model on cancel.

chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js

Index: chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
diff --git a/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js b/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
index dfd4bc7c9c47f2855e7a75e76afff08d9c84d7d2..5d8c75dba9d9f2a047a5d12ccf1a1c390c5a2ec4 100644
--- a/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
+++ b/chrome/browser/resources/settings/passwords_and_forms_page/autofill_section.js
@@ -62,8 +62,10 @@
      */
     onAddressMenuTap_: function(e) {
       var menuEvent = /** @type {!{model: !{item: !Object}}} */(e);
+
+      // Copy item so dialog won't update model on cancel.
       this.activeAddress = /** @type {!chrome.autofillPrivate.AddressEntry} */(
-          menuEvent.model.item);
+          Object.assign({}, menuEvent.model.item));
 
       var dotsButton = /** @type {!HTMLElement} */ (Polymer.dom(e).localTarget);
       /** @type {!CrActionMenuElement} */ (
@@ -117,9 +119,11 @@
      */
     onCreditCardMenuTap_: function(e) {
       var menuEvent = /** @type {!{model: !{item: !Object}}} */(e);
+
+      // Copy item so dialog won't update model on cancel.
       this.activeCreditCard =
           /** @type {!chrome.autofillPrivate.CreditCardEntry} */(
-              menuEvent.model.item);
+              Object.assign({}, menuEvent.model.item));
 
       var dotsButton = /** @type {!HTMLElement} */ (Polymer.dom(e).localTarget);
       /** @type {!CrActionMenuElement} */ (