Disable all the tests that are flaking more than 5% on ChromeOS builders.

chrome/browser/extensions/extension_service_unittest.cc

 // Copyright (c) 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 <algorithm>
 #include <set>
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/basictypes.h"
@@ skipping 4247 matching lines @@
     base::MessageLoop::current()->PostTask(FROM_HERE,
         base::Bind(&base::MessageLoop::Quit, weak_factory_.GetWeakPtr()));
     list_ = list;
   }
   net::CookieList list_;
   bool result_;
   base::WeakPtrFactory<base::MessageLoop> weak_factory_;
 };
 
 // Verifies extension state is removed upon uninstall.
-TEST_F(ExtensionServiceTest, ClearExtensionData) {
+#if defined(OS_CHROMEOS)
+// http://crbug.com/396504
+#define MAYBE_ClearExtensionData DISABLED_ClearExtensionData
+#else
+#define MAYBE_ClearExtensionData ClearExtensionData
+#endif
+TEST_F(ExtensionServiceTest, MAYBE_ClearExtensionData) {
   InitializeEmptyExtensionService();
   ExtensionCookieCallback callback;
 
   // Load a test extension.
   base::FilePath path = data_dir();
   path = path.AppendASCII("good.crx");
   const Extension* extension = InstallCRX(path, INSTALL_NEW);
   ASSERT_TRUE(extension);
   GURL ext_url(extension->url());
   std::string origin_id = webkit_database::GetIdentifierFromOrigin(ext_url);
@@ skipping 2740 matching lines @@
 
   service()->Observe(chrome::NOTIFICATION_PROFILE_DESTRUCTION_STARTED,
                      content::Source<Profile>(profile()),
                      content::NotificationService::NoDetails());
   EXPECT_EQ(UnloadedExtensionInfo::REASON_PROFILE_SHUTDOWN, unloaded_reason_);
   EXPECT_EQ(0u, registry()->enabled_extensions().size());
   EXPECT_EQ(0u, registry()->disabled_extensions().size());
   EXPECT_EQ(0u, registry()->terminated_extensions().size());
   EXPECT_EQ(0u, registry()->blacklisted_extensions().size());
 }