Fix runtime error thrown in chrome://interstitials/origin_policy.

Fixed: 1225573
Change-Id: I3c295b5edd4795a98cc9508668df2fbc668a3596
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3000839
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#897875}

Author: freshp86

components/security_interstitials/core/browser/resources/interstitial_large.js

@@ -82,8 +82,10 @@ function setupEvents() {
 
   if (ssl || originPolicy || blockedInterception || legacyTls) {
     $('body').classList.add(badClock ? 'bad-clock' : 'ssl');
-    $('error-code').textContent = loadTimeData.getString('errorCode');
-    $('error-code').classList.remove(HIDDEN_CLASS);
+    if (loadTimeData.valueExists('errorCode')) {
+      $('error-code').textContent = loadTimeData.getString('errorCode');
+      $('error-code').classList.remove(HIDDEN_CLASS);
+    }
   } else if (captivePortal) {
     $('body').classList.add('captive-portal');
   } else if (billing) {