Disable PluginTest.Quicktime. It sometimes flakes like

content/browser/plugin_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/command_line.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
@@ skipping 425 matching lines @@
 // Windows only test
 IN_PROC_BROWSER_TEST_F(PluginTest, DISABLED_FlashSecurity) {
   TestPlugin("flash.html");
 }
 #endif  // defined(OS_WIN)
 
 #if defined(OS_WIN)
 // TODO(port) Port the following tests to platforms that have the required
 // plugins.
 // Flaky: http://crbug.com/55915
-IN_PROC_BROWSER_TEST_F(PluginTest, MAYBE(Quicktime)) {
+IN_PROC_BROWSER_TEST_F(PluginTest, DISABLED_Quicktime) {
   TestPlugin("quicktime.html");
 }
 
 // Disabled - http://crbug.com/44662
 IN_PROC_BROWSER_TEST_F(PluginTest, MAYBE(MediaPlayerNew)) {
   TestPlugin("wmp_new.html");
 }
 
 // Disabled - http://crbug.com/44673
 IN_PROC_BROWSER_TEST_F(PluginTest, MAYBE(Real)) {
@@ skipping 97 matching lines @@
   ResourceDispatcherHostDelegate* old_delegate =
       ResourceDispatcherHostImpl::Get()->delegate();
   ResourceDispatcherHostImpl::Get()->SetDelegate(&test_delegate);
   LoadAndWait(url);
   test_delegate.WaitForPluginRequest();
   ASSERT_TRUE(test_delegate.found_cookie());
   ResourceDispatcherHostImpl::Get()->SetDelegate(old_delegate);
 }
 
 }  // namespace content