chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/test/ash_test_impl_aura.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 "ash/test/ash_test_impl_aura.h"
 
 #include "ash/common/test/ash_test.h"
 #include "ash/common/wm_window.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
@@ skipping 33 matching lines @@
 AshTestImplAura::~AshTestImplAura() {}
 
 void AshTestImplAura::SetUp() {
   ash_test_base_->SetUp();
 }
 
 void AshTestImplAura::TearDown() {
   ash_test_base_->TearDown();
 }
 
-bool AshTestImplAura::SupportsMultipleDisplays() const {
-  return ash_test_base_->SupportsMultipleDisplays();
-}
-
 void AshTestImplAura::UpdateDisplay(const std::string& display_spec) {
   ash_test_base_->UpdateDisplay(display_spec);
 }
 
 std::unique_ptr<WindowOwner> AshTestImplAura::CreateTestWindow(
     const gfx::Rect& bounds_in_screen,
     ui::wm::WindowType type,
     int shell_window_id) {
   return base::MakeUnique<WindowOwner>(
       WmWindow::Get(ash_test_base_->CreateTestWindowInShellWithDelegateAndType(
@@ skipping 34 matching lines @@
   ::wm::AddTransientChild(WmWindow::GetAuraWindow(parent),
                           WmWindow::GetAuraWindow(window));
 }
 
 // static
 std::unique_ptr<AshTestImpl> AshTestImpl::Create() {
   return base::MakeUnique<AshTestImplAura>();
 }
 
 }  // namespace ash