PlzNavigate: Move navigation-level mixed content checks to the browser.

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index f687beccf6a5d20fc95222aab1c22e6ed06a83fb..72bb56c892678344c0148e9f13905a093cf69914 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -857,6 +857,14 @@ void URLRequest::FollowDeferredRedirect() {
   job_->FollowDeferredRedirect();
 }
 
+const GURL& URLRequest::GetDeferredRedirectUrl() {
+  DCHECK(job_.get());
+  DCHECK(status_.is_success());
+  DCHECK(is_redirecting_);
+
+  return job_->deferred_redirect_info().new_url;
+}
+
 void URLRequest::SetAuth(const AuthCredentials& credentials) {
   DCHECK(job_.get());
   DCHECK(job_->NeedsAuth());