Rename fetch layout tests.

LayoutTests/http/tests/fetch/script-tests/thorough/cors-preflight.js

 if (self.importScripts) {
-  importScripts('../resources/fetch-test-helpers.js');
-  importScripts('../resources/fetch-access-control-util.js');
+  importScripts('/fetch/resources/fetch-test-helpers.js');
+  importScripts('/fetch/resources/thorough-util.js');
 }
 
 // Tests for CORS preflight fetch (simple methods).
 // Spec: https://fetch.spec.whatwg.org/#cors-preflight-fetch
 
 var TEST_TARGETS = [];
 
 ['GET', 'POST'].forEach(function(method) {
     var checkMethod = checkJsonpMethod.bind(this, method);
     TEST_TARGETS.push(
@@ skipping 88 matching lines @@
        '&headers=CUSTOM2&ACAOrigin=*&PACAOrigin=*&PACAHeaders=x-servicEworker-u, x-servicEworker-ua, x-servicewOrker-test, x-sErviceworker-s, x-sErviceworker-v&PACRMethod=' + method +
        '&PACRHeaders=x-serviceworker-s, x-serviceworker-test, x-serviceworker-u, x-serviceworker-ua, x-serviceworker-v&PreflightTest=200',
        [fetchResolved, noContentLength, noServerHeader, hasBody, typeCors],
        [checkMethod, hasCustomHeader2]]);
   });
 
 if (self.importScripts) {
   executeTests(TEST_TARGETS);
   done();
 }