ExtensionGalleryInstallApiTest.InstallAndUninstall is failing on 'XP Tests' bot.

chrome/browser/extensions/extension_gallery_install_apitest.cc

 // Copyright (c) 2010 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/stringprintf.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_webstore_private_api.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/ui_test_utils.h"
 #include "net/base/mock_host_resolver.h"
 
 class ExtensionGalleryInstallApiTest : public ExtensionApiTest {
  public:
   void SetUpCommandLine(CommandLine* command_line) {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitchASCII(switches::kAppsGalleryURL,
         "http://www.example.com");
   }
 };
 
-IN_PROC_BROWSER_TEST_F(ExtensionGalleryInstallApiTest, InstallAndUninstall) {
+// http://crbug.com/55642 - failing on XP.
+#if defined (OS_WIN)
+#define MAYBE_InstallAndUninstall FAILS_InstallAndUninstall
+#else
+#define MAYBE_InstallAndUninstall InstallAndUninstall
+#endif
+IN_PROC_BROWSER_TEST_F(ExtensionGalleryInstallApiTest,
+                       MAYBE_InstallAndUninstall) {
   host_resolver()->AddRule("www.example.com", "127.0.0.1");
   ASSERT_TRUE(test_server()->Start());
 
   std::string base_url = StringPrintf(
       "http://www.example.com:%u/files/extensions/",
       test_server()->host_port_pair().port());
 
   std::string testing_install_base_url = base_url;
   testing_install_base_url += "good.crx";
   InstallFunction::SetTestingInstallBaseUrl(testing_install_base_url.c_str());
 
   std::string page_url = base_url;
   page_url += "api_test/extension_gallery_install/test.html";
   ASSERT_TRUE(RunPageTest(page_url.c_str()));
 }