cros: Remove some OS platform ifdefs from ash

ash/shell_unittest.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 "ash/shell.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 66 matching lines @@
   EXPECT_TRUE(Shell::GetContainer(root_window, kShellWindowId_StatusContainer));
   EXPECT_TRUE(Shell::GetContainer(root_window, kShellWindowId_MenuContainer));
   EXPECT_TRUE(Shell::GetContainer(root_window,
                                   kShellWindowId_DragImageAndTooltipContainer));
   EXPECT_TRUE(
       Shell::GetContainer(root_window, kShellWindowId_SettingBubbleContainer));
   EXPECT_TRUE(
       Shell::GetContainer(root_window, kShellWindowId_OverlayContainer));
   EXPECT_TRUE(Shell::GetContainer(root_window,
                                   kShellWindowId_ImeWindowParentContainer));
-#if defined(OS_CHROMEOS)
   EXPECT_TRUE(
       Shell::GetContainer(root_window, kShellWindowId_MouseCursorContainer));
-#endif
 }
 
 class ModalWindow : public views::WidgetDelegateView {
  public:
   ModalWindow() {}
   ~ModalWindow() override {}
 
   // Overridden from views::WidgetDelegate:
   bool CanResize() const override { return true; }
   base::string16 GetWindowTitle() const override {
@@ skipping 403 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellTest2);
 };
 
 TEST_F(ShellTest2, DontCrashWhenWindowDeleted) {
   window_.reset(new aura::Window(NULL));
   window_->Init(ui::LAYER_NOT_DRAWN);
 }
 
 }  // namespace ash