chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/app_list/app_list_presenter_delegate_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 <memory>
 
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
@@ skipping 97 matching lines @@
   gfx::Point point_outside =
       gfx::Point(app_window_bounds.right(), app_window_bounds.y()) +
       gfx::Vector2d(10, 0);
   generator.GestureTapAt(point_outside);
   EXPECT_FALSE(app_list_presenter_impl()->GetTargetVisibility());
 }
 
 // Tests opening the app launcher on a non-primary display, then deleting the
 // display.
 TEST_F(AppListPresenterDelegateTest, NonPrimaryDisplay) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   // Set up a screen with two displays (horizontally adjacent).
   UpdateDisplay("1024x768,1024x768");
 
   std::vector<WmWindow*> root_windows = WmShell::Get()->GetAllRootWindows();
   ASSERT_EQ(2u, root_windows.size());
   WmWindow* secondary_root = root_windows[1];
   EXPECT_EQ("1024,0 1024x768", secondary_root->GetBoundsInScreen().ToString());
 
   app_list_presenter_impl()->Show(
       secondary_root->GetDisplayNearestWindow().id());
@@ skipping 21 matching lines @@
   // the actual app list position (the widget bounds include the bubble border
   // which is much bigger than the actual app list size).
   app_list::AppListView* app_list = app_list_presenter_impl()->GetView();
   int app_list_view_top =
       app_list->anchor_rect().y() - app_list->bounds().height() / 2;
   const int kMinimalAppListMargin = 10;
   EXPECT_GE(app_list_view_top, kMinimalAppListMargin);
 }
 
 }  // namespace ash