chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/test/ash_test_base.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 "ash/test/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/common/test/test_session_state_delegate.h"
@@ skipping 180 matching lines @@
       ->GetDisplayInfo(id)
       .GetActiveRotation();
 }
 
 // static
 display::Display::Rotation AshTestBase::GetCurrentInternalDisplayRotation() {
   return GetActiveDisplayRotation(display::Display::InternalDisplayId());
 }
 
 // static
-bool AshTestBase::SupportsMultipleDisplays() {
-  return AshTestHelper::SupportsMultipleDisplays();
-}
-
-// static
 void AshTestBase::UpdateDisplay(const std::string& display_specs) {
   display::test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
       .UpdateDisplay(display_specs);
 }
 
 aura::Window* AshTestBase::CurrentContext() {
   return ash_test_helper_->CurrentContext();
 }
 
 // static
@@ skipping 175 matching lines @@
 
 void AshTestBase::SwapPrimaryDisplay() {
   if (display::Screen::GetScreen()->GetNumDisplays() <= 1)
     return;
   Shell::GetInstance()->window_tree_host_manager()->SetPrimaryDisplayId(
       display_manager()->GetSecondaryDisplay().id());
 }
 
 }  // namespace test
 }  // namespace ash