Disable SystemTrayDelegateChromeOSTest.BluetoothStatus test

chrome/browser/ui/ash/system_tray_delegate_chromeos_unittest.cc

 // Copyright 2016 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 "chrome/browser/ui/ash/system_tray_delegate_chromeos.h"
 
 #include "ash/test/ash_test_base.h"
 #include "base/macros.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 37 matching lines @@
   }
 
  private:
   media::ScopedAudioManagerPtr audio_manager_;
   ScopedUserManagerEnabler user_manager_enabler_;
   ScopedCrosSettingsTestHelper settings_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateChromeOSTest);
 };
 
+// This test is times out flakily: http://crbug.com/639938
 // Test that checking bluetooth status early on does not cause a crash.
-TEST_F(SystemTrayDelegateChromeOSTest, BluetoothStatus) {
+TEST_F(SystemTrayDelegateChromeOSTest, DISABLED_BluetoothStatus) {
   SystemTrayDelegateChromeOS delegate;
   EXPECT_FALSE(delegate.GetBluetoothAvailable());
   EXPECT_FALSE(delegate.GetBluetoothEnabled());
   EXPECT_FALSE(delegate.IsBluetoothDiscovering());
 }
 
 }  // namespace chromeos