Introduce "navigate" mode in Requests

third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html
index a83a0b4e17f6322dc6b58e6a5d2881f9044cf318..b66d93e556822704f2be2ecbd8649c925f897379 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/request-end-to-end.html
@@ -20,7 +20,7 @@ promise_test(t => {
           assert_equals(result.url, frame.src, 'request.url');
           assert_equals(result.method, 'GET', 'request.method');
           assert_equals(result.referrer, location.href, 'request.referrer');
-          assert_equals(result.mode, 'same-origin', 'request.mode');
+          assert_equals(result.mode, 'navigate', 'request.mode');

[hiroshige, 2015/11/13 11:45:24]

Here (or in http/tests/serviceworker/fetch-request-fallback.html), we get
|result| originating a Request with navigate mode, so we can put the test there
(in resources/request-end-to-end-worker.js?) and get the test result here via
|result|.

[shiva.jm, 2015/11/16 10:08:01]

Done.

           assert_equals(result.credentials, 'include', 'request.credentials');
           assert_equals(result.redirect, 'manual', 'request.redirect');
           assert_equals(result.headers['user-agent'], navigator.userAgent,