chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/lock_layout_manager_unittest.cc

 // Copyright 2014 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/common/wm/window_state.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 226 matching lines @@
       target_bounds.height() -
       keyboard->ui()->GetKeyboardWindow()->bounds().height());
   EXPECT_EQ(target_bounds.ToString(), window->GetBoundsInScreen().ToString());
   ShowKeyboard(false);
 
   keyboard::SetKeyboardOverscrollOverride(
       keyboard::KEYBOARD_OVERSCROLL_OVERRIDE_NONE);
 }
 
 TEST_F(LockLayoutManagerTest, MultipleMonitors) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   UpdateDisplay("300x400,400x500");
   gfx::Rect screen_bounds =
       display::Screen::GetScreen()->GetPrimaryDisplay().bounds();
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
 
   views::Widget::InitParams widget_params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   widget_params.show_state = ui::SHOW_STATE_FULLSCREEN;
   std::unique_ptr<aura::Window> window(
       CreateTestLoginWindow(widget_params, false /* use_delegate */));
@@ skipping 30 matching lines @@
       ScreenUtil::GetDisplayWorkAreaBoundsInParent(window.get());
   window->SetBounds(work_area);
   // Usually work_area takes Shelf into account but that doesn't affect
   // LockScreen container windows.
   EXPECT_NE(work_area.ToString(), window->GetBoundsInScreen().ToString());
   EXPECT_EQ(screen_bounds.ToString(), window->GetBoundsInScreen().ToString());
 }
 
 }  // namespace test
 }  // namespace ash