Move promise_test and assert_promise_rejects out of worker-test-harness.

LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js

Index: LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js b/LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js
index 4129f8f8178f4f42f0aa135c383b31962ea1c99b..cb2bcfcd7c991071d13be0e9bad1816d23d1e972 100644
--- a/LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js
+++ b/LayoutTests/http/tests/serviceworker/resources/worker-test-harness.js
@@ -73,40 +73,5 @@ importScripts('/resources/testharness.js');
     });
 })();
 
-// 'promise_test' is a new kind of testharness test that handles some
-// boilerplate for testing with promises.
-function promise_test(func, name, properties) {
-  properties = properties || {};
-  var test = async_test(name, properties);
-  Promise.resolve(test.step(func, test, test))
-    .then(function() { test.done(); })
-    .catch(test.step_func(function(value) {
-        throw value;
-      }));
-}
+importScripts('/resources/testharness-helpers.js');
 
-// Returns a promise that fulfills after the provided |promise| is fulfilled.
-// The |test| succeeds only if |promise| rejects with an exception matching
-// |code|. Accepted values for |code| follow those accepted for assert_throws().
-// The optional |description| describes the test being performed.
-// E.g.:
-//   assert_promise_rejects(
-//       new Promise(...), // something that should throw an exception.
-//       'NotFoundError',
-//       'Should throw NotFoundError.');
-//
-//   assert_promise_rejects(
-//       new Promise(...),
-//       new TypeError(),
-//       'Should throw TypeError');
-function assert_promise_rejects(promise, code, description) {
-  return promise.then(
-    function() {
-      throw 'assert_promise_rejects: ' + description + ' Promise did not throw.';
-    },
-    function(e) {
-      if (code !== undefined) {
-        assert_throws(code, function() { throw e; }, description);
-      }
-    });
-}