Disable all the browser_tests that are flaking more than 5% of the time on trybots.

chrome/browser/extensions/crx_installer_browsertest.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/at_exit.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/crx_installer.h"
@@ skipping 379 matching lines @@
   const extensions::Extension* extension =
      service->GetExtensionById(extension_id, false);
   ASSERT_TRUE(extension);
   EXPECT_EQ(extension_id, extension->id());
 
   UninstallExtension(extension_id);
   EXPECT_FALSE(service->GetExtensionById(extension_id, false));
 }
 
 // See http://crbug.com/315299.
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_LINUX)
 #define MAYBE_InstallDelayedUntilNextUpdate \
         DISABLED_InstallDelayedUntilNextUpdate
 #else
 #define MAYBE_InstallDelayedUntilNextUpdate InstallDelayedUntilNextUpdate
-#endif  // defined(OS_WIN)
+#endif
 IN_PROC_BROWSER_TEST_F(ExtensionCrxInstallerTest,
                        MAYBE_InstallDelayedUntilNextUpdate) {
   const std::string extension_id("ldnnhddmnhbkjipkidpdiheffobcpfmf");
   base::FilePath crx_path = test_data_dir_.AppendASCII("delayed_install");
   ExtensionSystem* extension_system = extensions::ExtensionSystem::Get(
       browser()->profile());
   ExtensionService* service = extension_system->extension_service();
   ASSERT_TRUE(service);
 
   // Install version 1 of the test extension. This extension does not have
@@ skipping 155 matching lines @@
   ManagementPolicyMock policy;
   extensions::ExtensionSystem::Get(profile())
       ->management_policy()
       ->RegisterProvider(&policy);
 
   base::FilePath crx_path = test_data_dir_.AppendASCII("crx_installer/v1.crx");
   EXPECT_FALSE(InstallExtension(crx_path, 0));
 }
 
 }  // namespace extensions