cros: Remove some OS platform ifdefs from ash

ash/dip_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 <algorithm>
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 20 matching lines @@
 using DIPTest = test::AshMDTestBase;
 
 INSTANTIATE_TEST_CASE_P(
     /* prefix intentionally left blank due to only one parameterization */,
     DIPTest,
     testing::Values(MaterialDesignController::NON_MATERIAL,
                     MaterialDesignController::MATERIAL_NORMAL,
                     MaterialDesignController::MATERIAL_EXPERIMENTAL));
 
 // Test if the WM sets correct work area under different density.
-// TODO(msw): Broken on Windows. http://crbug.com/584038
-#if defined(OS_CHROMEOS)
 TEST_P(DIPTest, WorkArea) {
   const int height_offset = GetMdMaximizedWindowHeightOffset();
   UpdateDisplay("1000x900*1.0f");
 
   aura::Window* root = Shell::GetPrimaryRootWindow();
   const display::Display display =
       display::Screen::GetScreen()->GetDisplayNearestWindow(root);
 
   EXPECT_EQ("0,0 1000x900", display.bounds().ToString());
   gfx::Rect work_area = display.work_area();
@@ skipping 19 matching lines @@
             work_area.ToString());
   EXPECT_EQ(gfx::Insets(0, 0, 47 - height_offset, 0).ToString(),
             display_2x.bounds().InsetsFrom(work_area).ToString());
 
   // Sanity check if the workarea's inset hight is same as
   // the shelf's height.
   WmShelf* shelf = GetPrimaryShelf();
   EXPECT_EQ(display_2x.bounds().InsetsFrom(work_area).height(),
             shelf->shelf_widget()->GetNativeView()->layer()->bounds().height());
 }
-#endif  // defined(OS_CHROMEOS)
 
 }  // namespace ash