Enable immersive fullscreen on Windows Ash.

chrome/browser/ui/views/apps/chrome_native_app_window_views.cc

 // Copyright 2014 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 "chrome/browser/ui/views/apps/chrome_native_app_window_views.h"
 
 #include "apps/ui/views/app_window_frame_view.h"
 #include "base/command_line.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/app_mode/app_mode_utils.h"
@@ skipping 486 matching lines @@
           ash::PanelFrameView::FRAME_NONE : ash::PanelFrameView::FRAME_ASH;
       views::NonClientFrameView* frame_view =
           new ash::PanelFrameView(widget, frame_type);
       frame_view->set_context_menu_controller(this);
       return frame_view;
     }
 
     if (!IsFrameless()) {
       ash::CustomFrameViewAsh* custom_frame_view =
           new ash::CustomFrameViewAsh(widget);
-#if defined(OS_CHROMEOS)
       // Non-frameless app windows can be put into immersive fullscreen.
-      // TODO(pkotwicz): Investigate if immersive fullscreen can be enabled for
-      // Windows Ash.
       immersive_fullscreen_controller_.reset(
           new ash::ImmersiveFullscreenController());
       custom_frame_view->InitImmersiveFullscreenControllerForView(
           immersive_fullscreen_controller_.get());
-#endif
       custom_frame_view->GetHeaderView()->set_context_menu_controller(this);
       return custom_frame_view;
     }
   }
 #endif
   if (!ShouldUseNativeFrame())
     return CreateAppWindowFrameView();
   return views::WidgetDelegateView::CreateNonClientFrameView(widget);
 }
 
@@ skipping 151 matching lines @@
       NULL));
 
 #if defined(OS_WIN)
   if (!ShouldUseNativeFrame() &&
       chrome::GetHostDesktopTypeForNativeWindow(window()->GetNativeWindow()) !=
       chrome::HOST_DESKTOP_TYPE_ASH) {
     InstallEasyResizeTargeterOnContainer();
   }
 #endif
 }