chromeos: Remove AshTestBase::SupportsMultipleDisplays

ash/system/toast/toast_manager_unittest.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/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/system/toast/toast_manager.h"
 #include "ash/common/wm/wm_screen_util.h"
 #include "ash/common/wm_shell.h"
 #include "ash/shell.h"
@@ skipping 237 matching lines @@
   EXPECT_EQ(root_bounds.bottom() - 5, toast_bounds.bottom());
 
   gfx::Rect shelf_bounds = shelf->GetIdealBounds();
   EXPECT_FALSE(toast_bounds.Intersects(shelf_bounds));
   EXPECT_NEAR(
       shelf_bounds.right() + (root_bounds.width() - shelf_bounds.width()) / 2.0,
       precise_toast_bounds.CenterPoint().x(), 1.f /* accepted error */);
 }
 
 TEST_F(ToastManagerTest, PositionWithUnifiedDesktop) {
-  if (!SupportsMultipleDisplays())
-    return;
   display_manager()->SetUnifiedDesktopEnabled(true);
   UpdateDisplay("1000x500,0+600-100x500");
 
   WmShelf* shelf = GetPrimaryShelf();
   EXPECT_EQ(SHELF_ALIGNMENT_BOTTOM, shelf->GetAlignment());
   EXPECT_EQ(SHELF_VISIBLE, shelf->GetVisibilityState());
 
   ShowToast("DUMMY", ToastData::kInfiniteDuration);
   EXPECT_EQ(1, GetToastSerial());
 
@@ skipping 28 matching lines @@
   EXPECT_EQ(base::ASCIIToUTF16("TEXT3"), GetCurrentText());
   // Cancel the shown toast.
   CancelToast(id3);
   // Confirm that the shown toast disappears.
   EXPECT_FALSE(GetCurrentOverlay());
   // Confirm that only 1 toast is shown.
   EXPECT_EQ(2, GetToastSerial());
 }
 
 }  // namespace ash