Remove explict frame removal from fetch-request-css-base-url.html test

third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html
index 7d44101adc85222403c728f8a329df68dedc32c5..3654d6d5b27967266174702442e507d11e43c74a 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/fetch-request-css-base-url.html
@@ -36,7 +36,6 @@ async_test(function(t) {
                   base + 'resources/fetch-request-css-base-url-style.css',
                   'While loading the image defined in CSS the referrer must ' +
                   'be the request URL of CSS.');
-                frame.remove();
                 service_worker_unregister_and_done(t, SCOPE);
               });
               worker.postMessage(