Do not call lower() on domains set from DOM after canonicalization

third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html

Index: third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html b/third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html
index 4b4869c7f79f4450fd15803885265d5d5534cbf6..84c06ba008ad821444dfba36d6f2d846e8f8f000 100644
--- a/third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html
+++ b/third_party/WebKit/LayoutTests/http/tests/security/document-domain-canonicalizes.html
@@ -9,14 +9,21 @@
 
 <script>
 if (document.location.hostname == "127.0.0.1") {
-  document.location.hostname = "subdomain.example.test";
+  document.location.hostname = "sub,.subdomain.example.test";
 } else {
   test(function() {
+      // Properly canonicalize the host.
+      assert_equals(document.location.hostname, "sub%2C.subdomain.example.test");
+
       document.domain = 'EXAMPLE.TEST';
       assert_equals(document.domain, 'example.test');
 
       document.domain = 'subdomain.eXamPle.tEst';
       assert_equals(document.domain, 'subdomain.example.test');
+
+      document.domain = 'sub,.subdomain.example.test';
+      assert_equals(document.domain, 'sub%2C.subdomain.example.test');
+
   }, 'document.domain goes through proper canonicalization.');
 }
 </script>