chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/display/root_window_transformers_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/display/root_window_transformers.h"
 
 #include <memory>
 
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/display/display_util.h"
@@ skipping 237 matching lines @@
   EXPECT_EQ(display::Display::ROTATE_180,
             GetActiveDisplayRotation(display1.id()));
   EXPECT_EQ(display::Display::ROTATE_270,
             GetActiveDisplayRotation(display2_id));
   magnifier->SetEnabled(false);
 
   Shell::GetInstance()->RemovePreTargetHandler(&event_handler);
 }
 
 TEST_F(RootWindowTransformersTest, ScaleAndMagnify) {
-  if (!SupportsMultipleDisplays())
-    return;
-
   TestEventHandler event_handler;
   Shell::GetInstance()->AddPreTargetHandler(&event_handler);
 
   UpdateDisplay("600x400*2@1.5,500x300");
 
   display::Display display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
   display::test::ScopedSetInternalDisplayId set_internal(display_manager(),
                                                          display1.id());
   display::Display display2 = display_manager()->GetSecondaryDisplay();
   aura::Window::Windows root_windows = Shell::GetAllRootWindows();
@@ skipping 145 matching lines @@
   generator.MoveMouseToInHost(0, 0);
   EXPECT_EQ("159,99", event_handler.GetLocationAndReset());
 
   magnifier->SetEnabled(false);
   EXPECT_FLOAT_EQ(1.0f, magnifier->GetScale());
 
   Shell::GetInstance()->RemovePreTargetHandler(&event_handler);
 }
 
 TEST_F(RootWindowTransformersTest, LetterBoxPillarBox) {
-  if (!SupportsMultipleDisplays())
-    return;
   test::MirrorWindowTestApi test_api;
   display_manager()->SetMultiDisplayMode(display::DisplayManager::MIRRORING);
   UpdateDisplay("400x200,500x500");
   std::unique_ptr<RootWindowTransformer> transformer(
       CreateCurrentRootWindowTransformerForMirroring());
   // Y margin must be margin is (500 - 500/400 * 200) / 2 = 125.
   EXPECT_EQ("0,125,0,125", transformer->GetHostInsets().ToString());
 
   UpdateDisplay("200x400,500x500");
   // The aspect ratio is flipped, so X margin is now 125.
   transformer = CreateCurrentRootWindowTransformerForMirroring();
   EXPECT_EQ("125,0,125,0", transformer->GetHostInsets().ToString());
 }
 
 }  // namespace ash