Disable the externally connectable tests on windows.

chrome/browser/extensions/extension_messages_apitest.cc

 // Copyright (c) 2012 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 "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 116 matching lines @@
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnablePanels);
   }
 };
 
 IN_PROC_BROWSER_TEST_F(PanelMessagingTest, MessagingPanel) {
   ASSERT_TRUE(RunExtensionTest("messaging/connect_panel")) << message_;
 }
 
+// XXX(kalman): All web messaging tests disabled on windows due to extreme
+// flakiness. See http://crbug.com/350517.
+#if !defined(OS_WIN)
+
 // Tests externally_connectable between a web page and an extension.
 //
 // TODO(kalman): Test between extensions. This is already tested in this file,
 // but not with externally_connectable set in the manifest.
 //
 // TODO(kalman): Test with host permissions.
 class ExternallyConnectableMessagingTest : public ExtensionApiTest {
  protected:
   // Result codes from the test. These must match up with |results| in
   // c/t/d/extensions/api_test/externally_connectable/assertions.json.
@@ skipping 799 matching lines @@
   // The presence of the chromium hosted app triggers this bug. The chromium
   // connectable extension needs to be installed to set up the runtime bindings.
   LoadChromiumHostedApp();
   LoadChromiumConnectableExtension();
 
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR ,
             CanConnectAndSendMessages("invalid"));
 }
 
+#endif  // !defined(OS_WIN) - http://crbug.com/350517.
+
 }  // namespace
 
 };  // namespace extensions