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

LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js b/LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js
index b877c9976960580c566cdaa3706a743b460f8f57..c8af0230afdbfccacff3f24df3197f926b15dae6 100644
--- a/LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js
+++ b/LayoutTests/http/tests/serviceworker/resources/cache-put-worker.js
@@ -102,9 +102,9 @@ cache_test(function(cache) {
           return cache.match(test_url);
         })
       .then(function(result) {
-          assert_object_equals(result, response,
-                               'Cache.put should update the cache with ' +
-                               'new request and response.');
+          assert_equals(result.status, 200, 'Cache.put should store status.');
+          assert_equals(result.headers.get('Content-Type'), 'text/plain',
+                        'Cache.put should store headers.');
           return result.text();
         })
       .then(function(body) {