Consolidate navigation-timing tests into web-platform-tests

LayoutTests/http/tests/w3c/webperf/approved/navigation-timing/ and
LayoutTests/external/wpt/navigation-timing/ have the same origin but
have diverged slightly over time.

https://chromium-review.googlesource.com/c/chromium/src/+/782419 shows
what the interesting differences between the two copies were.

metadata_cache in most of the tests were removed when the tests were
initially added to web-platform-tests:
web-platform-tests/wpt#181

idlharness.html: It's OK to no longer test an instance of Window,
that's being done in the hr-time test:
web-platform-tests/wpt#8388

test_timing_xserver_redirect.html: The bits around pageOrigin were
removed in web-platform-tests/wpt@234a672.
That assert was still failing in our own tests, but removing it is OK,
using location.hostname is wrong as it doesn't include the port:
https://html.spec.whatwg.org/multipage/links.html#dom-hyperlink-hostname


Change-Id: Ic5c4151a3e309fee1894c72cd14d159bd314be20
Reviewed-on: https://chromium-review.googlesource.com/781684
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Takeshi Yoshino <tyoshino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518626}

third_party/WebKit/LayoutTests/external/wpt/navigation-timing/idlharness.html

@@ -19,11 +19,6 @@ <h1>Navigation Timing IDL tests</h1>
 <pre id='untested_idl' style='display:none'>
 typedef double DOMHighResTimeStamp;
 
-interface Window {
-    [Replaceable]
-    readonly attribute Performance performance;
-};
-
 [Exposed=(Window,Worker)]
 interface Performance {
 };
@@ -140,7 +135,8 @@ <h1>Navigation Timing IDL tests</h1>
   idl_array.add_untested_idls(document.getElementById("untested_idl").textContent);
   idl_array.add_idls(document.getElementById("idl").textContent);
 
-  idl_array.add_objects({PerformanceNavigation: ["window.performance.navigation"],
+  idl_array.add_objects({Performance: ["window.performance"],
+                         PerformanceNavigation: ["window.performance.navigation"],
                          PerformanceTiming: ["window.performance.timing"],
                          PerformanceNavigationTiming: ["window.performance.getEntriesByType('navigation')[0]"] });