Don't filter iframes for manually allowed URLs.

This cl updates IsMainFrameWhitelisted to include domains which the
parents have manually whitelisted. This can happen when a child asks
for permission and the parent manually approves it.

Bug: 850328
Change-Id: I056ccf9f5bc1385013eb0f41cf0014c2c859a45b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837409
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704431}

chrome/browser/supervised_user/supervised_user_navigation_throttle.cc

@@ -126,8 +126,10 @@ bool IsMainFrameWhitelisted(content::WebContents* web_contents) {
       behavior == SupervisedUserURLFilter::FilteringBehavior::ALLOW;
   bool is_whitelisted =
       reason == supervised_user_error_page::FilteringBehaviorReason::WHITELIST;
+  bool is_manual =
+      reason == supervised_user_error_page::FilteringBehaviorReason::MANUAL;
 
-  return is_allowed && is_whitelisted;
+  return is_allowed && (is_whitelisted || is_manual);
 }
 
 }  // namespace