chromeos: Remove AshTestBase::SupportsMultipleDisplays

ui/display/manager/display_manager.cc

 // Copyright (c) 2012 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 "ui/display/manager/display_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <map>
@@ skipping 618 matching lines @@
     display_info_list.push_back(GetDisplayInfo(display.id()));
   AddMirrorDisplayInfoIfAny(&display_info_list);
   UpdateDisplaysWith(display_info_list);
 }
 
 void DisplayManager::UpdateDisplaysWith(
     const DisplayInfoList& updated_display_info_list) {
 #if defined(OS_WIN)
   DCHECK_EQ(1u, updated_display_info_list.size())
       << ": Multiple display test does not work on Windows bots. Please "
-         "skip (don't disable) the test using SupportsMultipleDisplays()";
+         "skip (don't disable) the test.";
 #endif
 
   DisplayInfoList new_display_info_list = updated_display_info_list;
   std::sort(active_display_list_.begin(), active_display_list_.end(),
             DisplaySortFunctor());
   std::sort(new_display_info_list.begin(), new_display_info_list.end(),
             DisplayInfoSortFunctor());
 
   if (new_display_info_list.size() > 1) {
     DisplayIdList list = GenerateDisplayIdList(
@@ skipping 787 matching lines @@
 }
 
 const Display& DisplayManager::GetSecondaryDisplay() const {
   CHECK_LE(2U, GetNumDisplays());
   return GetDisplayAt(0).id() == Screen::GetScreen()->GetPrimaryDisplay().id()
              ? GetDisplayAt(1)
              : GetDisplayAt(0);
 }
 
 }  // namespace display