chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/wm/immersive_fullscreen_controller_unittest.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/shared/immersive_fullscreen_controller.h"
 
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/display/mouse_cursor_event_filter.h"
 #include "ash/public/cpp/shelf_types.h"
@@ skipping 478 matching lines @@
   EXPECT_TRUE(controller()->IsRevealed());
   MoveMouse(top_container_bounds_in_screen.x(),
             top_container_bounds_in_screen.bottom() + 50);
   EXPECT_FALSE(controller()->IsRevealed());
 }
 
 // Test mouse event processing for top-of-screen reveal triggering when the user
 // has a vertical display layout (primary display above/below secondary display)
 // and the immersive fullscreen window is on the bottom display.
 TEST_F(ImmersiveFullscreenControllerTest, MouseEventsVerticalDisplayLayout) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Set up initial state.
   UpdateDisplay("800x600,800x600");
   ash::Shell::GetInstance()->display_manager()->SetLayoutForCurrentDisplays(
       display::test::CreateDisplayLayout(display_manager(),
                                          display::DisplayPlacement::TOP, 0));
 
   SetEnabled(true);
   ASSERT_TRUE(controller()->IsEnabled());
   ASSERT_FALSE(controller()->IsRevealed());
 
@@ skipping 522 matching lines @@
   SetEnabled(true);
   EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());
 
   // Disabling immersive fullscreen maintains the user's auto-hide selection.
   SetEnabled(false);
   window()->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
   EXPECT_EQ(SHELF_AUTO_HIDE, shelf->GetVisibilityState());
 }
 
 }  // namespase ash