Remove Blink copies of readable-streams layout tests

third_party/WebKit/LayoutTests/http/tests/streams/readable-streams/garbage-collection.js

-'use strict';
-
-if (self.importScripts) {
-  self.importScripts('../resources/test-utils.js');
-  self.importScripts('/resources/testharness.js');
-}
-
-promise_test(() => {
-
-  let controller;
-  new ReadableStream({
-    start(c) {
-      controller = c;
-    }
-  });
-
-  garbageCollect();
-
-  return delay(50).then(() => {
-    controller.close();
-    assert_throws(new TypeError(), () => controller.close(), 'close should throw a TypeError the second time');
-    assert_throws(new TypeError(), () => controller.error(), 'error should throw a TypeError on a closed stream');
-  });
-
-}, 'ReadableStreamController methods should continue working properly when scripts lose their reference to the ' +
-   'readable stream');
-
-promise_test(() => {
-
-  let controller;
-
-  const closedPromise = new ReadableStream({
-    start(c) {
-      controller = c;
-    }
-  }).getReader().closed;
-
-  garbageCollect();
-
-  return delay(50).then(() => controller.close()).then(() => closedPromise);
-
-}, 'ReadableStream closed promise should fulfill even if the stream and reader JS references are lost');
-
-promise_test(t => {
-
-  const theError = new Error('boo');
-  let controller;
-
-  const closedPromise = new ReadableStream({
-    start(c) {
-      controller = c;
-    }
-  }).getReader().closed;
-
-  garbageCollect();
-
-  return delay(50).then(() => controller.error(theError))
-                  .then(() => promise_rejects(t, theError, closedPromise));
-
-}, 'ReadableStream closed promise should reject even if stream and reader JS references are lost');
-
-promise_test(() => {
-
-  const rs = new ReadableStream({});
-
-  rs.getReader();
-
-  garbageCollect();
-
-  return delay(50).then(() => assert_throws(new TypeError(), () => rs.getReader(),
-    'old reader should still be locking the stream even after garbage collection'));
-
-}, 'Garbage-collecting a ReadableStreamReader should not unlock its stream');
-
-done();