chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/test/ash_test_helper.cc

 // Copyright 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 "ash/test/ash_test_helper.h"
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/test/material_design_controller_test_api.h"
 #include "ash/common/test/test_session_state_delegate.h"
@@ skipping 188 matching lines @@
 }
 
 aura::Window* AshTestHelper::CurrentContext() {
   aura::Window* root_window = Shell::GetTargetRootWindow();
   if (!root_window)
     root_window = Shell::GetPrimaryRootWindow();
   DCHECK(root_window);
   return root_window;
 }
 
-// static
-bool AshTestHelper::SupportsMultipleDisplays() {
-  // TODO(jamescook): Figure out if we want SupportsMultipleDisplays() to return
-  // false on mustash. If not, remove this function and the AshTestBase version
-  // and remove calls from all the tests. For now just leave the ifdef strings
-  // OS_CHROMEOS and OS_WIN in this comment as a reminder to clean up.
-  // http://crbug.com/682990
-  return true;
-}
-
 }  // namespace test
 }  // namespace ash