Enabling WorkerTest.MessagePorts as the upstream regression was fixed:...

chrome/worker/worker_uitest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/worker_host/worker_service.h"
 #include "chrome/test/automation/browser_proxy.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/ui/ui_layout_test.h"
 
 static const char kTestCompleteCookie[] = "status";
@@ skipping 134 matching lines @@
   worker_test_dir = worker_test_dir.AppendASCII("xmlhttprequest");
   worker_test_dir = worker_test_dir.AppendASCII("workers");
   InitializeForLayoutTest(http_test_dir, worker_test_dir, true);
 
   StartHttpServer(new_http_root_dir_);
   for (size_t i = 0; i < arraysize(kLayoutTestFiles); ++i)
     RunLayoutTest(kLayoutTestFiles[i], true);
   StopHttpServer();
 }
 
-TEST_F(WorkerTest, DISABLED_MessagePorts) {
+TEST_F(WorkerTest, MessagePorts) {
   static const char* kLayoutTestFiles[] = {
     "message-channel-gc.html",
     "message-channel-gc-2.html",
     "message-channel-gc-3.html",
     "message-channel-gc-4.html",
     "message-port.html",
     "message-port-clone.html",
     "message-port-constructor-for-deleted-document.html",
     "message-port-deleted-document.html",
     "message-port-deleted-frame.html",
@@ skipping 62 matching lines @@
             UITest::GetBrowserProcessCount());
 
   // Now close the first tab and check that the queued workers were started.
   tab->Close(true);
   tab->NavigateToURL(GetTestUrl(L"google", L"google.html"));
 
   EXPECT_EQ(total_workers + 1 + (UITest::in_process_renderer() ? 0 : tab_count),
             UITest::GetBrowserProcessCount());
 }
 #endif