Disable tab_switching_tests, which have been failing consistently on XP and Vista Interactive Per...

chrome/test/perf/tab_switching_test.cc

 // Copyright (c) 2011 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/command_line.h"
 #include "base/environment.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/path_service.h"
@@ skipping 165 matching lines @@
  private:
   void AddLaunchArguments() {
     launch_arguments_.AppendSwitch(switches::kEnableLogging);
     launch_arguments_.AppendSwitch(switches::kDumpHistogramsOnExit);
     launch_arguments_.AppendSwitchASCII(switches::kLoggingLevel, "0");
   }
 
   DISALLOW_COPY_AND_ASSIGN(TabSwitchingUITest);
 };
 
-TEST_F(TabSwitchingUITest, TabSwitch) {
+#if defined(OS_WIN)
+// Started failing with a webkit roll in r49936. See http://crbug.com/46751
+#define MAYBE_TabSwitch FAILS_TabSwitch
+#define MAYBE_TabSwitchRef FAILS_TabSwitchRef
+#else
+#define MAYBE_TabSwitch TabSwitch
+#define MAYBE_TabSwitchRef TabSwitchRef
+#endif
+
+TEST_F(TabSwitchingUITest, MAYBE_TabSwitch) {
   RunTabSwitchingUITest("t", true);
 }
 
-TEST_F(TabSwitchingUITest, TabSwitchRef) {
+TEST_F(TabSwitchingUITest, MAYBE_TabSwitchRef) {
   UseReferenceBuild();
   RunTabSwitchingUITest("t_ref", true);
 }
 
 }  // namespace