Bug 1783497 - Update test_url_data.html r=smaug

Due to the changes to chrome url canonicalization, this
test doesn't make sense anymore.

Differential Revision: https://phabricator.services.mozilla.com/D159864

dom/url/tests/test_url_data.html

@@ -13,11 +13,7 @@
 
 var base = new URL("data:text/plain,");
 
-base.protocol = "chrome:";
-is(base.protocol, "data:", "The protocol should not change from data to chrome.");
-
 let relative;
-
 try {
   relative = new URL("a", base);
   ok(false, "Relative URL from a data:text/plain should not work.");
@@ -25,6 +21,16 @@ try {
   ok(true, "Relative URL from a data:text/plain should not work.");
 }
 
+base.protocol = "chrome:";
+is(base.protocol, "chrome:", "The protocol should be changed from data to chrome.");
+
+try {
+  relative = new URL("a", base);
+  ok(true, "Relative URL from a chrome: should work.");
+} catch (e) {
+  ok(false, "Relative URL from a chrome: should work.");
+}
+
 base.protocol = "http:";
 ok(true, "Protocol: http changed");
 is(base.href, "http://text/plain,", "Base URL is correct");

testing/web-platform/meta/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol.https.html.ini

@@ -247,9 +247,6 @@
   [unregisterProtocolHandler: Invalid URL "ftp://web-platform.test:8443/%s" should throw SECURITY_ERR.]
     expected: FAIL
 
-  [registerProtocolHandler: Invalid URL "chrome://web-platform.test:8443/%s" should throw SECURITY_ERR.]
-    expected: FAIL
-
   [unregisterProtocolHandler: Invalid URL "chrome://web-platform.test:8443/%s" should throw SECURITY_ERR.]
     expected: FAIL