Disable WebViewTest.AutoSizeSW which is flaky on XP bots.

chrome/browser/apps/web_view_browsertest.cc

 // Copyright 2013 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 "apps/native_app_window.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
 #include "chrome/browser/automation/automation_util.h"
@@ skipping 587 matching lines @@
 #endif
 
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/web_view/autosize"))
       << message_;
 }
 
 #if !defined(OS_CHROMEOS)
 // This test ensures <webview> doesn't crash in SW rendering when autosize is
 // turned on.
 IN_PROC_BROWSER_TEST_F(WebViewTest, AutoSizeSW) {
+#if defined(OS_WIN)
+  // Flaky on XP bot http://crbug.com/299507
+  if (base::win::GetVersion() <= base::win::VERSION_XP)
+    return;
+#endif
   ASSERT_TRUE(RunPlatformAppTest("platform_apps/web_view/autosize"))
       << message_;
 }
 #endif
 
 IN_PROC_BROWSER_TEST_F(WebViewTest, Shim_TestAutosizeAfterNavigation) {
   TestHelper("testAutosizeAfterNavigation",
              "DoneShimTest.PASSED",
              "DoneShimTest.FAILED",
              "web_view/shim");
@@ skipping 1200 matching lines @@
   }
 };
 
 IN_PROC_BROWSER_TEST_F(WebViewPluginTest, TestLoadPluginEvent) {
   TestHelper("testPluginLoadPermission",
              "DoneShimTest.PASSED",
              "DoneShimTest.FAILED",
              "web_view/shim");
 }
 #endif  // defined(ENABLE_PLUGINS)