Update Cache.put() test to accept string as request

LayoutTests/http/tests/serviceworker/cache-put-expected.txt

Index: LayoutTests/http/tests/serviceworker/cache-put-expected.txt
diff --git a/LayoutTests/http/tests/serviceworker/cache-put-expected.txt b/LayoutTests/http/tests/serviceworker/cache-put-expected.txt
index ac9391a8bb869e61e3fe38cf46de99367ef03e79..30bb5b02aa77941a0853f49c890b97ccaf0fd349 100644
--- a/LayoutTests/http/tests/serviceworker/cache-put-expected.txt
+++ b/LayoutTests/http/tests/serviceworker/cache-put-expected.txt
@@ -7,7 +7,7 @@ FAIL Cache.put with a Response containing an empty URL assert_equals: Cache.put
 PASS Cache.put with an empty response body 
 PASS Cache.put with HTTP 500 response 
 FAIL Cache.put called twice with same Request and different Responses Entry already exists.
-FAIL Cache.put with an invalid request assert_promise_rejects: Cache.put should only accept a Request object as the request. Promise did not reject.
+PASS Cache.put with an string request 
 PASS Cache.put with an invalid response 
 PASS Cache.put with a non-HTTP/HTTPS request 
 FAIL Cache.put with a relative URL assert_equals: Cache.put should accept a relative URL as the request. :[object].url expected "" but got "http://127.0.0.1:8000/serviceworker/resources/relative-url"