Service Worker: Remove redundant assertions from Cache.put() test case

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 acf77727cd3cea606d9abfb415895d40e840ffdf..ac9391a8bb869e61e3fe38cf46de99367ef03e79 100644
--- a/LayoutTests/http/tests/serviceworker/cache-put-expected.txt
+++ b/LayoutTests/http/tests/serviceworker/cache-put-expected.txt
@@ -4,7 +4,7 @@ PASS Cache.put called with simple Request and Response
 PASS Cache.put called with Request and Response from fetch() 
 FAIL Cache.put with Request containing a body assert_false: Cache.put should not consume Request body. expected false got true
 FAIL Cache.put with a Response containing an empty URL assert_equals: Cache.put should update the cache with new Request and Response. :[object].url expected "" but got "https://example.com/foo"
-FAIL Cache.put with an empty response body assert_equals: Cache.put should update the cache with new request and response. :[object].url expected "" but got "https://example.com/foo"
+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.