Revert of Worker: Import "imported/wpt/workers" tests

third_party/WebKit/LayoutTests/imported/wpt/workers/interfaces/DedicatedWorkerGlobalScope/onmessage.worker.js

-importScripts("/resources/testharness.js");
-
-test(function() {
-  self.onmessage = 1;
-  assert_equals(self.onmessage, null,
-                "attribute should return null after being set to a primitive");
-}, "Setting onmessage to 1");
-
-test(function() {
-  var object = {
-    handleEvent: this.unreached_func()
-  };
-  self.onmessage = object;
-  assert_equals(self.onmessage, object,
-                "attribute should return the object it was set to.");
-
-  self.dispatchEvent(new Event("message"));
-}, "Setting onmessage to an object");
-
-test(function() {
-  var triggered = false;
-  var f = function(e) { triggered = true; };
-  self.onmessage = f;
-  assert_equals(self.onmessage, f,
-                "attribute should return the function it was set to.");
-
-  self.dispatchEvent(new Event("message"));
-  assert_true(triggered, "event handler should have been triggered");
-}, "Setting onmessage to a function");
-
-
-test(function() {
-  assert_not_equals(self.onmessage, null,
-                    "attribute should not return null after being set to a function");
-  self.onmessage = 1;
-  assert_equals(self.onmessage, null,
-                "attribute should return null after being set to a primitive");
-}, "Setting onmessage to 1 (again)");
-
-done();